Patent Publication Number: US-9844806-B2

Title: Dual-phase hot extrusion of metals

Description:
FIELD 
     The present disclosure relates to dual-phase hot extrusion of metals and metal materials and the machines and apparatuses used for producing the same. 
     BACKGROUND 
     Generally, extrusion is the process by which a block or billet of metal is reduced in cross section and shaped by forcing it to flow through a die under high pressure. Most metals are hot extruded due to the large amount of forces required in extrusion. In a typical extrusion process, an extrusion billet is heated and placed in a container of a hydraulic extrusion press. A dummy block is placed between the ram of the extrusion press and the heated billet. The ram then applies pressure to the heated billet and forces the billet through a shaped die to form an extrusion product. 
     The physical properties of a metal may be advantageously influenced by the presence of one or more other metals. For example, the combination of two or more metals (i.e., alloying) may provide improved or changed thermal conductivity, electrical conductivity, or tensile properties in comparison to either of the pure metals. Accordingly, it is desirable to formulate metal materials containing more than one metal. This may be accomplished by casting, wherein each metal is melted to its molten form and then solidified together. This may also be accomplished by extrusion, wherein each metal is in its solid form. It has generally been considered, however, that hot extrusion in which a molten metal is contained within a solid metal carrier cannot be achieved due to the high extrusion forces and tendency for the molten metal to blow out of the solid metal carrier. 
     SUMMARY 
     Surprisingly, the processes and apparatuses described herein permit the controlled hot extrusion of a solid metal carrier comprising a molten metal or metal alloy. The extrusion of dual-phase hot metals, as described herein, is therefore a useful process by which new metal materials having modified thermal conductivity, electrical conductivity, or tensile properties may be formed. As used herein, the term “dual-phase” refers to the physical states of the extruded metals, not to their crystalline lattice structures. For example, in one embodiment of the present disclosure, a solid, metal comprising interior chambers containing molten metal may be extruded. 
     In one aspect, the disclosure describes a load carrier suitable for dual-phase hot metal extrusion made of a first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a load material and a void space, wherein the load material comprises a second metal material, the second metal material having a lower melting point than the melting point of the first metal material, and wherein the void space is configured to accommodate at least a portion of the second metal material in its molten form when the load carrier is heated. 
     In another aspect, the disclosure describes a load carrier suitable for dual-phase hot metal extrusion made of a metal material comprising copper, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a fluted spacer and a load material, wherein the load material comprises aluminum, antimony, magnesium, tin, zinc, or any combination thereof. 
     In another aspect, the disclosure describes a method of dual-phase hot metal extrusion comprising the steps of: (i) providing a load carrier made of a first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a load material and a void space, wherein the load material comprises a second metal material, the second metal material having a lower melting point than the melting point of the first metal material, and wherein the void space is configured to accommodate at least a portion of the second metal material in its molten form when the load carrier is heated; (ii) heating the load carrier to a temperature above the melting point of the second metal material but below the melting point of the first metal material to form a solid load carrier comprising a liquid metal in the at least one load chamber; and (iii) extruding the heated load carrier to provide an extruded product. 
     In still another aspect, the disclosure describes a method of dual-phase hot metal extrusion comprising the steps of: (i) providing a load carrier made of a first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a load material and a void space, wherein the load material comprises a second metal material, the second metal material having a lower melting point than the melting point of the first metal material, and wherein the void space is configured to accommodate at least a portion of the second metal material in its molten form when the load carrier is heated; (ii) heating the load carrier to a temperature above the melting point of the second metal material but below the melting point of the first metal material to form a solid load carrier comprising a liquid metal in the at least one load chamber; (iii) extruding the heated load carrier to provide a first extruded product; (iv) providing a second load carrier made of the first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a second load material, wherein the second load material is the first extruded material; (v) heating the second load carrier to a temperature suitable for extrusion; and (vi) extruding the second load carrier to provide a second extruded product. 
     In a further aspect, the present disclosure describes an extrusion product made of a primary metal comprising about 20 filaments to about 2,000 filaments of a second metal material disposed through at least a portion of the length of the extruded metal product. In another aspect, the present disclosure is directed to an extruded metal product comprising about 1,000 filaments to about 10 million filaments of a second metal material disposed through at least a portion of the length of the extruded metal product. 
     In yet a further aspect, the present disclosure describes an extrusion tool comprising a first extrusion die, a second extrusion die, and a cooling cavity, wherein an extrusion transfer channel extends from the first extrusion die through the cooling cavity to the second extrusion die, wherein the portion of the extrusion transfer channel extending through the cooling cavity comprises at least one opening located between the first extrusion die and the second extrusion die, and wherein the cooling cavity comprises at least one cooling port configured to provide a cooling agent at the at least one opening of the extrusion transfer channel. 
     In another aspect, the present disclosure describes a method of dual-phase hot metal extrusion comprising the steps of: (i) providing a load carrier made of a first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a load material and a void space, wherein the load material comprises a second metal material, the second metal material having a lower melting point than the melting point of the first metal material, and wherein the void space is configured to accommodate at least a portion of the second metal material in its molten form when the load carrier is heated; (ii) heating the load carrier to a temperature above the melting point of the second metal material but below the melting point of the first metal material to form a solid load carrier comprising a liquid metal in the at least one load chamber; (iii) providing an extrusion tool comprising a first extrusion die, a second extrusion die, and a cooling cavity, wherein an extrusion transfer channel extends from the first extrusion die through the cooling cavity to the second extrusion die of the extrusion tool, wherein the portion of the extrusion transfer channel extending through the cooling cavity comprises at least one opening located between the first extrusion die and the second extrusion die, and wherein the cooling cavity comprises at least one cooling port configured to provide a cooling agent at the at least one opening of the extrusion transfer channel; (iv) providing a cooling agent through the at least one cooling port; and (v) extruding the heated load carrier through the extrusion tool to provide an extruded product. 
     In still another aspect, the present disclosure describes a method of dual-phase hot metal extrusion comprising the steps of: (i) providing a load carrier made of a first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a load material and a void space, wherein the load material comprises a second metal material, the second metal material having a lower melting point than the melting point of the first metal material, and wherein the void space is configured to accommodate at least a portion of the second metal material in its molten form when the load carrier is heated; (ii) heating the load carrier to a temperature above the melting point of the second metal material but below the melting point of the first metal material to form a solid load carrier comprising a liquid metal in the at least one load chamber; (iii) providing an extrusion tool comprising a first extrusion die, a second extrusion die, and a cooling cavity, wherein an extrusion transfer channel extends from the first extrusion die through the cooling cavity to the second extrusion die of the extrusion tool, wherein the portion of the extrusion transfer channel extending through the cooling cavity comprises at least one opening located between the first extrusion die and the second extrusion die, and wherein the cooling cavity comprises at least one cooling port configured to provide a cooling agent at the at least one opening of the extrusion transfer channel; (iv) providing a cooling agent through the at least one cooling port; (v) extruding the heated load carrier through the extrusion tool to provide an extruded product; (vi) providing a second load carrier made of the first metal material, wherein the second load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a second load material, wherein the second load material is the extruded product formed in step v); (vii) heating the second load carrier to a temperature suitable for melting the second metal material in the extruded product and suitable for extruding the second load carrier; and (viii) extruding the second load carrier to provide a second extruded product. 
     In a further aspect, the present disclosure describes a method of dual-phase hot metal extrusion comprising the steps of: (i) providing a load carrier made of a first metal material, wherein the load carrier comprises a load end, a blind end, and at least one load chamber having a depth extending axially from the load end towards the blind end, wherein the at least one load chamber comprises a load material and a void space, wherein the load material comprises a second metal material, the second metal material having a lower melting point than the melting point of the first metal material, and wherein the void space is configured to accommodate at least a portion of the second metal material in its molten form when the load carrier is heated; (ii) heating the load carrier to a temperature above the melting point of the second metal material but below the melting point of the first metal material to form a solid load carrier comprising a liquid metal in the at least one load chamber; (iii) providing an extrusion tool comprising a first extrusion die, a second extrusion die, and a cooling cavity, wherein an extrusion transfer channel extends from the first extrusion die through the cooling cavity to the second extrusion die of the extrusion tool, wherein the portion of the extrusion transfer channel extending through the cooling cavity comprises at least one opening located between the first extrusion die and the second extrusion die, and wherein the cooling cavity comprises at least one cooling port configured to provide a cooling agent at the at least one opening of the extrusion transfer channel; (iv) providing a cooling agent through the at least one cooling port; and (v) continuously extruding the heated load carrier, wherein the load carrier is extruded through the first extrusion die, contacted with water, and extruded through the second extrusion die inside the container of an extrusion press. 
     In another aspect, the present disclosure describes an extruded composition comprising a primary metal or metal alloy and having a length, the extruded composition comprising filaments extending axially along at least a portion of the length of the extruded composition, wherein the filaments comprise a secondary metal or metal alloy and a cross-section of the extruded composition perpendicular to the length comprises at least 25 filaments. 
     In yet another aspect, the present disclosure describes an extruded composition comprising a primary metal or metal alloy and having a length, the extruded composition comprising filaments extending axially along at least a portion of the length of the extruded composition, wherein the filaments comprise a secondary metal or metal alloy and a cross-section of the extruded composition perpendicular to the length comprises at least 25 filaments, wherein at least one filament in the cross-section of the extruded composition has an average cross-sectional surface area of between about 1 nm 2  to about 10 cm 2 . 
     In still another aspect, the present disclosure describes a copper extrusion product comprising filaments extending axially along at least a portion of the length of the copper extrusion product, wherein the filaments comprise aluminum, antimony, magnesium, tin, zinc, or any combination thereof, and a cross-section of the copper extrusion product perpendicular to the length comprises at least 25 filaments. 
     Other embodiments, objects, features, and advantages will be set forth in the detailed description of the embodiments that follow and, in part, will be apparent from the description or may be learned by practice of the claimed invention. These objects and advantages will be realized and attained by the compositions and methods described and claimed herein. The foregoing Summary has been made with the understanding that it is to be considered as a brief and general synopsis of some of the embodiments disclosed herein, is provided solely for the benefit and convenience of the reader, and is not intended to limit in any manner the scope, or range of equivalents, to which the appended claims are lawfully entitled. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cylindrical load carrier with a load chamber. 
         FIG. 2A  is a top-view of the load end of a load carrier containing a configuration of twenty-five load chambers. 
         FIG. 2B  is a top-view of the load end of a load carrier containing a staggered configuration of thirty-seven load chambers. 
         FIG. 3A  is a side-view of a fluted spacer. 
         FIG. 3B  is a top-view of a fluted spacer. 
         FIG. 4  is a cross-sectional view along the primary axis of a load carrier comprising a load chamber loaded with a fluted spacer, a load material, a non-fluted spacer, and a plug. 
         FIG. 5  is a cross-sectional view along the primary axis of a load carrier comprising five load chambers, each load chamber loaded with a fluted spacer, a load material, a non-fluted spacer, and a plug. 
         FIG. 6  is a cross-sectional view along the primary axis of a load carrier comprising a load chamber loaded with a load material disposed between two non-fluted spacers and a plug. 
         FIG. 7  is a cross-sectional view of a cylindrical extrusion tool as disclosed herein. 
         FIG. 8  is an end view of the back end of a cylindrical extrusion tool as disclosed herein. 
         FIG. 9A  is an end view of the second extrusion die of an extrusion tool as disclosed herein. 
         FIG. 9B  is a side view of the second extrusion die of  FIG. 9A . 
         FIG. 10A  is a cross-sectional view of the cooling cavities of an extrusion tool as disclosed herein. 
         FIG. 10B  is a cross-sectional view of the cooling cavities of an extrusion tool as disclosed herein, wherein an extrusion product is disposed with the extrusion transfer channel. 
         FIG. 11  is a cross-sectional view of a backing manifold engaged in an extrusion press die holder. 
         FIG. 12  is an end view of the free end of a backing manifold engaged in an extrusion press die holder. 
         FIG. 13  is a cross-sectional view of a portion of an extrusion press comprising a container, a dummy block, a load carrier as described herein, an extrusion tool as described herein configured within the container, and a backing manifold engaged in a die press holder and against the extrusion tool. 
     
    
    
     DESCRIPTION 
     While the present disclosure is capable of being embodied in various forms, the description below of several embodiments is made with the understanding that the present disclosure is to be considered as an exemplification of the claimed subject matter, and is not intended to limit the appended claims to the specific embodiments illustrated and/or described. Accordingly, it should not be construed to limit the scope or breadth of the present invention. The headings used throughout this disclosure are provided for convenience only and are not to be construed to limit the claims in any way. Embodiments illustrated under any heading may be combined with embodiments illustrated under any other heading. 
     In one embodiment, the present disclosure provides a method for extruding a load carrier  1  made of a first metal material and containing a second metal material having a lower melting point than the first metal material, wherein the load carrier  1  is heated to a temperature at which the second metal material comprises a liquid metal and the load carrier  1  is extrudable, and the heated load carrier  1  containing the liquid metal is extruded to produce an extruded material. In another embodiment, the present disclosure provides a method for extruding a load carrier  1  made of a first metal material and containing a second metal material, wherein the load carrier  1  is heated to a temperature at which the first and second metal materials form an alloy having a melting point lower than the first metal material and the load carrier  1  is extrudable, and the heated load carrier  1  containing the alloy is extruded to produce an extruded material. 
     The load carrier  1  may be made of any desirable metal, including metals and metal alloys, that is extrudable. In one embodiment, the load carrier  1  may be made of copper or a copper alloy. In another embodiment, the load carrier  1  may be made of aluminum or an aluminum alloy. In yet another embodiment, the load carrier  1  may be made of brass. In another embodiment, the load carrier  1  may be made of lead or a lead alloy. In still another embodiment, the load carrier  1  may be made of tin or a tin alloy. In another embodiment, the load carrier  1  may be made of magnesium or a magnesium alloy. In another embodiment, the load carrier  1  may be made of zinc or a zinc alloy. In another embodiment, the load carrier  1  may be made of steel. In another embodiment, the load carrier  1  may be made of titanium or a titanium alloy. Other exemplary metals and metal alloys are known to those of ordinary skill in the art and would be understood to be within the scope of the present disclosure. 
     In one embodiment, the second metal material may comprise any desirable metal that is molten or that forms an alloy having a melting temperature lower than the extrusion temperature. Suitable metals include but are not limited to lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, scandium, yttrium, lanthanum, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, gold, zinc, cadmium, aluminum, gallium, indium, thallium, silicon, germanium, tin, lead, antimony, bismuth, tellurium, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thullium, ytterbium, lutetium, any combinations thereof, and any alloys thereof. 
     The load carrier  1  may be extruded at any suitable temperature. In one embodiment, the load carrier  1  may be extruded at a temperature ranging from about 30% to about 90% of the melting point of the load carrier  1 . In another embodiment, the load carrier  1  may be extruded at a temperature ranging from about 40% to about 80% of the melting point of the load carrier  1 . In yet another embodiment, the load carrier  1  may be extruded at a temperature ranging from about 50% to about 75% of the melting point of the load carrier  1 . In other embodiments, the load carrier  1  may be extruded at a temperature ranging from about 30%, about 31%, about 32%, about 33%, about 34%, about 35%, about 36%, about 37%, about 38%, about 39%, about 40%, about 41%, about 42%, about 43%, about 44%, about 45%, about 46%, about 47%, about 48%, about 49%, about 50%, about 51%, about 52%, about 53%, about 54%, about 55%, about 56%, about 57%, about 58%, about 59%, about 60%, about 61%, about 62%, about 63%, about 64%, about 65%, about 66%, about 67%, about 68%, about 69%, about 70%, about 71%, about 72%, about 73%, about 74%, about 75%, about 76%, about 77%, about 78%, about 79%, about 80%, about 81%, about 82%, about 83%, about 84%, about 85%, about 86%, about 87%, about 88%, about 89%, or about 90% of the melting point of the load carrier  1 . 
     The load carrier  1  may be extruded in an extrusion press at any suitable pressure. In one embodiment, the load carrier  1  may be extruded in an extrusion press having a pressure of about 20 MPa to about 900 MPa. In another embodiment, the load carrier  1  may be extruded in an extrusion press having a pressure of about 35 MPa to about 800 MPa. In still another embodiment, the load carrier  1  may be extruded in an extrusion press having a pressure of about 50 MPa to about 700 MPa. In other embodiments, the load carrier  1  may be extruded in an extrusion press having a pressure of about 20 MPa, about 25 MPa, about 50 MPa, about 75 MPa, about 100 MPa, about 125 MPa, about 150 MPa, about 175 MPa, about 200 MPa, about 225 MPa, about 250 MPa, about 275 MPa, about 300 MPa, about 325 MPa, about 350 MPa, about 375 MPa, about 400 MPa, about 425 MPa, about 450 MPa, about 475 MPa, about 5000 MPa, about 525 MPa, about 550 MPa, about 575 MPa, about 600 MPa, about 625 MPa, about 650 MPa, about 675 MPa, about 700 MPa, about 725 MPa, about 750 MPa, about 775 MPa, about 800 MPa, about 825 MPa, about 850 MPa, about 875 MPa, about 900 MPa, or even higher. 
     The load carrier  1  may be extruded at any desirable ram speed. In one embodiment, the load carrier  1  may be extruded at a ram speed of about 0.0005 m/s to about 1 m/s. In another embodiment, the load carrier  1  may be extruded at a ram speed of about 0.01 m/s to about 0.75 m/s. In a further embodiment, the load carrier  1  may be extruded at a ram speed of about 0.1 m/s to about 0.50 m/s. In other embodiments, the load carrier  1  may be extruded at a ram speed of about 0.0005 m/s, about 0.001 m/s, about 0.0015 m/s, about 0.002 m/s, about 0.0025 m/s, about 0.003 m/s, about 0.0035 m/s, about 0.004 m/s, about 0.0045 m/s, about 0.005 m/s, about 0.0055 m/s, about 0.006 m/s, about 0.0065 m/s, about 0.007 m/s, about 0.0075 m/s, about 0.008 m/s, about 0.0085 m/s, about 0.009 m/s, about 0.0095 m/s, about 0.010 m/s, about 0.015 m/s, about 0.02 m/s, about 0.025 m/s, about 0.03 m/s, about 0.035 m/s, about 0.04 m/s, about 0.045 m/s, about 0.05 m/s, about 0.055 m/s, about 0.60 m/s, about 0.065 m/s, about 0.07 m/s, about 0.075 m/s, about 0.08 m/s, about 0.085 m/s, about 0.09 m/s, about 0.095 m/s, about 0.1 m/s, about 0.15 m/s, about 0.2 m/s, about 0.25 m/s, about 0.3 m/s, about 0.35 m/s, about 0.4 m/s, about 0.45 m/s, about 0.5 m/s, about 0.55 m/s, about 0.6 m/s, about 0.65 m/s, about 0.7 m/s, about 0.75 m/s, about 0.8 m/s, about 0.85 m/s, about 0.9 m/s, about 0.95 m/s, or about 1.0 m/s. 
     In another aspect, the present disclosure is further illustrated by reference to the pictorial embodiments of the aforementioned drawings. The drawings shall in no way be construed to be limiting. The present disclosure specifically contemplates other embodiments not illustrated but intended to be within the scope of the appended claims. 
       FIG. 1  depicts a load carrier  1  having a load end  2  and a blind end  3  with a load chamber  4  having a depth extending axially from the top surface  18  of the load end  2  towards the blind end  3  of the load carrier. As used herein, the term “load carrier” refers to any metallic container, including but not limited to castings and fabrications, that holds the load material during the dual-phase hot extrusion process. The load carrier  1  comprises an inlet  5  through the top surface  18  of the load end  2  that provides an opening into the load chamber  4 . Although the load carrier  1  is depicted as cylindrical, the load carrier  1  may be any desired shape suitable for extrusion. Similarly, the shape of the inlet  5  of the load chamber  4  may be any desirable shape. 
     The depth of a load chamber  4  may be any desired depth. In one embodiment, the depth of a load chamber  4  may be from about 10% to about 95% of the length of the load carrier  1 . In another embodiment, the depth of a load chamber  4  may be from about 15% to about 90% of the length of the load carrier  1 . In yet another embodiment, the depth of a load chamber  4  may be from about 20% to about 85% of the length of the load carrier  1 . In still another embodiment, the depth of a load chamber  4  may be from about 25% to about 80% of the length of the load carrier  1 . In a further embodiment, the depth of a load chamber  4  may be from about 30% to about 75% of the length of the load carrier  1 . In yet a further embodiment, the depth of a load chamber  4  may be from about 35% to about 70% of the length of the load carrier  1 . In other embodiments, the depth of a load chamber  4  may be about 10%, 13%, 15%, 17%, 20%, 23%, 25%, 27%, 30%, 33%, 35%, 37%, 40%, 43%, 45% 47%, 50%, 53%, 55%, 57%, 60%, 63%, 65%, 67%, 70%, 73%, 75%, 77%, 80%, 83%, 85%, 87%, 90%, 93%, or 95% of the length of the load carrier  1 . 
       FIG. 2A  is a top-view of the load end  2  of a cylindrical load carrier  1  comprising a central load chamber  4  surrounded by a first ring of twelve load chambers  4  radially spaced at 30° apart and a second ring of twelve load chambers  4  also radially spaced at 30° apart.  FIG. 2B  is a top-view of the load end  2  of a cylindrical load carrier  1  comprising thirty-seven load chambers  4  arranged in a hexagonal configuration. As is evident from  FIGS. 2A and 2B , the size and pattern of the load chambers may be any desired size and pattern. 
     The load carrier  1  may comprise from one load chamber to about 500 load chambers. In another embodiment, the load carrier  1  may comprise from one load chamber to about 400 load chambers. In yet another embodiment, the load carrier  1  may comprise from one load chamber to about 300 load chambers. In a further embodiment, the load carrier  1  may comprise from one load chamber to about 200 load chambers. In still another embodiment, the load carrier  1  may comprise from one load chambers to about 100 load chambers. In one embodiment, the load carrier  1  may comprise from about 5 load chambers to about 95 load chambers. In another embodiment, the load carrier  1  may comprise from about 10 load chambers to about 90 load chambers. In another embodiment, the load carrier  1  may comprise from about 15 load chambers to about 85 load chambers. In still another embodiment, the load carrier  1  may comprise from about 20 load chambers to about 80 load chambers. In a further embodiment, the load carrier  1  may comprise from about 25 load chambers to about 75 load chambers. In other embodiments, the load carrier  1  may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or 100 load chambers. 
     In embodiments wherein the load carrier  1  comprises multiple load chambers  4 , the depths of the multiple load chambers  4  may be the same or different. In one embodiment, the multiple load chambers  4  may be disposed at a single depth. In another embodiment, the multiple load chambers  4  may be disposed at two different depths. In yet another embodiment, the multiple load chambers  4  may be disposed at three different depths. In still another embodiment, the multiple load chambers  4  may be disposed at four different depths. In a further embodiment, the multiple load chambers  4  may be disposed at five different depths. In other embodiments, the multiple load chambers  4  may be disposed at 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or 100 different depths. 
     The depth of any load chamber  4  may be any suitable depth. In one embodiment, the depth of any load chamber  4  may be from about 10% to about 90% of the length of the load carrier  1 , wherein the length of the load carrier  1  is the distance between the top surface  2  and blind end  3  of the load carrier  1 . In a further embodiment, the depth of any load chamber  4  may be from about 20% to about 80% of the length of the load carrier  1 . In another embodiment, the depth of any load chamber  4  may be from about 30% to about 70% of the length of the load carrier  1 . In still a further embodiment, the depth of any load chamber  4  may be from about 40% to about 60% of the length of the load carrier  1 . In other embodiments, the depth of any load chamber  4  may be about 10%, about 11%, about 12%, about 13%, about 14%, about 15%, about 16%, about 17%, about 18%, about 19%, about 20%, about 21%, about 22%, about 23%, about 24%, about 25%, about 26%, about 27%, about 28%, about 29%, about 30%, about 31%, about 32%, about 33%, about 34%, about 35%, about 36%, about 37%, about 38%, about 39%, about 40%, about 41%, about 42%, about 43%, about 44%, about 45%, about 46%, about 47%, about 48%, about 49%, about 50%, about 51%, about 52%, about 53%, about 54%, about 55%, about 56%, about 57%, about 58%, about 59%, about 60%, about 61%, about 62%, about 63%, about 64%, about 65%, about 66%, about 67%, about 68%, about 69%, about 70%, about 71%, about 72%, about 73%, about 74%, about 75%, about 76%, about 77%, about 78%, about 79%, about 80%, about 81%, about 82%, about 83%, about 84%, about 85%, about 86%, about 87%, about 88%, about 89%, or about 90% of the length of the load carrier  1 . 
       FIG. 3A  is a side-view of a spacer  6  having a bottom end  7  and a top end  8 . A flute  9  extends axially from the top end  8  towards the bottom end  7  of the spacer  6 . The flute  9  extends for a portion of the length of the spacer  6 .  FIG. 3B  is a top-view of the top end  8  of the spacer  6  showing three flutes  9  located on the outside perimeter of the spacer  6 . Although the cylindrical spacer  6  depicted in  FIG. 3B  comprises three flutes  9 , any number of flutes may be used in accordance with the present disclosure. In one embodiment, the spacer  6  may contain one flute. In another embodiment, the spacer  6  may contain two flutes. In yet another embodiment, the spacer  6  may contain three flutes. In a further embodiment, the spacer  6  may contain four flutes. In still other embodiments, the spacer  6  may contain 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18 flutes. In another embodiment, the spacer  6  may be non-fluted (i.e., comprising no flutes). 
     A spacer  6  may be made of any material or composition suitable for hot metal extrusion. Generally, the spacer material should be the same or a similar composition as and should be compatible with the load carrier material. In one embodiment, the load carrier  1  and spacers  6  are made of a metal comprising copper. In another embodiment, the load carrier  1  and spacers  6  are made of a metal comprising aluminum. In yet another embodiment, the load carrier  1  and spacers  6  are made of a metal comprising brass. In a further embodiment, the load carrier  1  and spacers  6  are made of a metal comprising lead. In still a further embodiment, the load carrier  1  and spacers  6  are made of a metal comprising tin. In one embodiment, the load carrier  1  and spacers  6  are made of a metal comprising magnesium. In another embodiment, the load carrier  1  and spacers  6  are made of a metal comprising zinc. In still another embodiment, the load carrier  1  and spacers  6  are made of a metal comprising steel. In a further embodiment, the load carrier  1  and spacers  6  are made of a metal comprising titanium. 
       FIG. 4  is a cross-sectional view of a load chamber  4  along the length of a load carrier  1  comprising a fluted spacer  10 , a load material  11 , a non-fluted spacer  12 , and a plug  13 . The bottom end  7  of the fluted spacer  10  is shaped to fit the load chamber such that no air or other gas pockets are formed between the fluted spacer  10  and the load chamber  4  except for the void space  14  formed by the flute  9  and the wall of the load chamber  4 . 
     The total volume of void space  14  provided by a fluted spacer  9  may be sufficient to accommodate at least a portion of the increased volume of the load material  11  caused by thermal expansion when heated to the extrusion temperature (ΔV=V T(extrusion) −V Ti ). In one embodiment, ΔV of the load material may be from about 1% to about 100% of the initial volume of the load material. In another embodiment, ΔV of the load material may be from about 5% to about 90% of the initial volume of the load material. In still another embodiment, ΔV of the load material may be from about 10% to about 80% of the initial volume of the load material. In yet another embodiment, ΔV of the load material may be from about 15% to about 70% of the initial volume of the load material. In a further embodiment, ΔV of the load material may be from about 20% to about 60% of the initial volume of the load material. In still other embodiments, ΔV of the load material may be about 1%, about 2%, about 3%, about 4%, about 5%, about 6%, about 7%, about 8%, about 9%, about 10%, about 11%, about 12%, about 13%, about 14%, about 15%, about 16%, about 17%, about 18%, about 19%, about 20%, about 21%, about 22%, about 23%, about 24%, about 25%, about 26%, about 27%, about 28%, about 29%, about 30%, about 31%, about 32%, about 33%, about 34%, about 35%, about 36%, about 37%, about 38%, about 39%, about 40%, about 41%, about 42%, about 43%, about 44%, about 45%, about 46%, about 47%, about 48%, about 49%, about 50%, about 51%, about 52%, about 53%, about 54%, about 55%, about 56%, about 57%, about 58%, about 59%, about 60%, about 61%, about 62%, about 63%, about 64%, about 65%, about 66%, about 67%, about 68%, about 69%, about 70%, about 71%, about 72%, about 73%, about 74%, about 75%, about 76%, about 77%, about 78%, about 79%, about 80%, about 81%, about 82%, about 83%, about 84%, about 85%, about 86%, about 87%, about 88%, about 89%, about 90%, about 91%, about 92%, about 93%, about 94%, about 95%, about 96%, about 97%, about 98%, about 99%, or about 100% of the initial volume of the load material. 
     Although the void space  14  shown in  FIG. 4  is provided by a fluted spacer, the void space may be provided by any other suitable means. For example, the load chamber  4  may be milled to contain a void space, which is in contact with the load material upon heating or the void space may be provided by a hollowed, non-fluted spacer. 
       FIG. 5  is a cross-sectional view of a load carrier  1  comprising five load chambers  4 . Each load chamber  4  comprises a fluted spacer  10 , a load material  11 , a non-fluted spacer  12 , and a plug  13 . Each load chamber  4  extends from the top surface  2  towards the bottom surface  3  to a different depth and contains a void space  14  formed by the flute  9  of the fluted spacer  10  and the wall of the load chamber  4 . The plug  13  can be any suitable plug sufficient to secure the load material  11  within the load chamber  4  during the hot extrusion process. In one embodiment, the plug  13  may be a set screw. In another embodiment, the plug  13  may be a pipe plug. In yet another embodiment, the plug  13  may by a tapered plug. In still another embodiment, the plug  13  may be a tapered plug. In still another embodiment, the plug  13 , may be a welded plug. In a further embodiment, the plug  13  may be a swaged plug. In still a further embodiment, the plug  13  may be a brazed plug. 
     In another aspect, the present disclosure provides a method of dual-phase hot metal extrusion comprising (i) providing a first load carrier  1  made of a first metal material and containing in one or more load chambers  4  a second metal material having a lower melting point than the first metal material, (ii) heating the first load carrier  1  to a temperature at which the second metal material comprises a liquid metal and the first load carrier  1  is extrudable, (iii) extruding the first load carrier  1  containing the liquid metal to produce a first extruded product, (iv) providing a second load carrier  15  made of the same or a different metal material as the first load carrier comprising one or more load chambers  4 , (v) securing a portion of the first extruded product in the one or more load chambers  4 , (vi) heating the second load carrier to a temperature at which the second metal material in the first extruded product comprises a liquid metal and the second load carrier  15  is extrudable, and (vii) extruding the second load carrier  15  to form a second extruded product. 
     In one embodiment, both the first load carrier  1  and second load carrier  15  are extruded through flow extrusion dies. This process provides an efficient method for incorporating numerous filaments of the second metal material through at least a portion of the length of the second extruded product. In one embodiment, about 20 filaments to about 2,000 filaments of the second metal material extend axially along at least a portion of the length of the second extruded product. In another embodiment, about 25 to about 1,500 filaments of the second metal material extend axially along at least a portion of the length of the second extruded product. In a further embodiment, about 30 to about 1,000 filaments of the second metal material extend axially along at least a portion of the length of the second extruded product. As used herein, “extend axially” means to extend in the same general direction as the length of the extruded product and does not mean to extend perfectly parallel to the length of the extruded product. Accordingly, the term “extend axially” permits local deviation in the axial direction of the filament so long as the filament generally extends along at least a portion of the length of the extruded product. For example, a filament or portion of a filament extending axially along the length of an extrusion product or a load chamber extending axially along the length of a load carrier may be oriented at an angle that is about 1°, about 2°, about 3°, about 4°, about 5°, about 6°, about 7°, about 8°, about 9°, about 10°, about 11°, about 12°, about 13°, about 14°, about 15°, about 16°, about 17°, about 18°, about 19°, about 20°, about 21°, about 23°, about 24°, about 25°, about 26°, about 27°, about 28°, about 29°, about 30°, about 31°, about 32°, about 33°, about 34°, about 35°, about 36°, about 37°, about 38°, about 39°, about 40°, about 41°, about 42°, about 43°, about 44°, or about 45° relative to the axis along the length of extrusion product or load carrier. 
     In one embodiment, the second extruded product may comprise at least 500 filaments of the second metal material. In another embodiment, the second extruded product may comprise at least 1,000 filaments of the second metal material. In still another embodiment, the second extruded product may comprise at least 1,500 filaments of the second metal material. For example, a second extruded product containing 925 filaments of a second metal material can be produced using a first load carrier  1  comprising twenty-five load chambers  4  and a second load carrier  15  comprising thirty-seven load chambers. Similarly, a second extruded product containing 1,369 filaments of a second metal material can be produced using a first load carrier  1  comprising thirty-seven load chambers  4  and second load carrier  15  comprising thirty-seven load chambers. 
     In other embodiments, the second extruded product may comprise at least 25, at least 50, at least 75, at least 100, at least 150, at least 200, at least 250, at least 300, at least 350, at least 400, at least 450, at least 500, at least 550, at least 600, at least 650, at least 700, at least 750, at least 800, at least 850, at least 900, at least 950, at least 1000, at least 1050, at least 1100, at least 1150, at least 1200, at least 1250, at least 1300, at least 1350, at least 1400, at least 1450, at least 1500, at least 1650, at least 1700, at least 1750, at least 1800, at least 1850, at least 1900, at least 1950, at least 2000, at least 2050, at least 2100, at least 2150, at least 2200, at least 2250, at least 2300, at least 2350, at least 2400, at least 2450, at least 2500, at least 2650, at least 2700, at least 2750, at least 2800, at least 2850, at least 2900, at least 2950, or at least 3,000 filaments of the second metal material. 
     In another embodiment, this process may be iterated any desired number of times to produce an extruded product containing from about 1,000 to about 10,000 million filaments of the second metal material. In one embodiment, an extruded product may comprise from about 2,000 to about 1 million filaments of the second metal material. In another embodiment, an extruded product may comprise from about 5,000 to about 500,000 filaments of the second metal material. In yet a further embodiment, an extruded product may comprise from about 10,000 to about 250,000 filaments. In other embodiments, an extruded product may comprise at least 1,000, at least 2,500, at least 5,000, at least 7,500, at least 10,000, at least 15,000, at least 25,000, at least 50,000, at least 75,000, at least 150,000, at least 250,000, at least 500,000, at least 750,000, at least 1 million, at least 1.25 million, at least 1.5 million, at least 1.75 million, at least 2 million, at least 2.5 million, at least 3 million, at least 3.5 million, at least 4 million, at least 4.5 million, at least 5 million, at least 5.5 million, at least 6 million, at least 6.5 million, at least 7 million, at least 7.5 million, at least 8 million, at least 9 million, or at least 10 million filaments of the second metal material. 
     In one embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament from about 1 nm 2  to about 10 cm 2 . In another embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament from about 1 μm 2  to about 1 cm 2 . In yet another embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament from about 1 mm 2  to about 0.5 cm 2 . In still another embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament of between about 1 nm 2  and 1 μm 2 . In a further embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament of between about 1 μm 2  to about 1 mm 2 . In still a further embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament of between about 1 mm 2  to about 1 cm 2 . In another embodiment, a cross-section of an extruded composition may comprise filaments having an average surface area per filament of between about 1 cm 2  to about 10 cm 2 . In still other embodiments, a cross-section of an extruded composition may comprise filaments having an average surface area per filament of at least 1 nm 2 , at least 10 nm 2 , at least 100 nm 2 , at least 1000 nm 2 , at least 1 μm 2 , at least 4 μm 2 , at least 9 μm 2 , at least 16 μm 2 , at least 25 μm 2 , at least 36 μm 2 , at least 49 μm 2 , at least 64 μm 2 , at least 81 μm 2 , at least 100 μm 2 , at least 1000 μm 2 , at least 1 mm 2 , at least 4 mm 2 , at least 9 mm 2 , at least 16 mm 2 , at least 25 mm 2 , at least 36 mm 2 , at least 49 mm 2 , at least 64 mm 2 , at least 81 mm 2 , at least 100 mm 2 , at least 1000 mm 2 , at least 0.001 cm 2 , at least 0.01 cm 2 , at least 0.1 cm 2 , at least 1 cm 2 , at least 2 cm 2 , at least 4 cm 2 , at least 9 cm 2 , or at least 10 cm 2 . 
     In a further embodiment, the first load carrier  1  is extruded through a flow extrusion die and the second load carrier  15  is extruded through a shear extrusion die. In this process, the load material is randomly dispersed in at least a portion of the second extrusion product. In other embodiments, the second extrusion product containing randomly dispersed load material may be re-extruded through a shear extrusion die any number of times to further randomly disperse the load material throughout the extrusion product. 
     In another aspect, the present disclosure provides a method of dual-phase hot metal extrusion comprising (i) providing a first load carrier  1  made of a first metal material and containing in one or more load chambers  4  a second metal material having a lower melting point than the first metal material, (ii) heating the first load carrier  1  to a temperature at which the first and second metal materials form a liquid alloy and the first load carrier  1  is extrudable, (iii) extruding the first load carrier  1  containing the liquid alloy to produce a first extruded product, (iv) providing a second load carrier  15  made of the same or a different metal material as the first load carrier comprising one or more load chambers  4 , (v) securing a portion of the first extruded product in the one or more load chambers  4 , (vi) heating the second load carrier to a temperature at which the first and second metal materials in the first extruded product form a liquid alloy and the second load carrier  15  is extrudable, and (vii) extruding the second load carrier  15  to form a second extruded product. 
       FIG. 6  is a cross-sectional view of a load carrier  15  having a load chamber  4  comprising a first non-fluted spacer  16 , a load material  17  wherein the load material  17  is a product previously extruded in accordance with the disclosure herein, a second non-fluted spacer  12 , and a plug  13 . 
     In another aspect, the present disclosure provides tooling useful for dual-phase hot metal extrusion processes. In general, an extrusion tool is provided comprising a first extrusion die, a second extrusion die, and a cooling cavity. This extrusion tool is further illustrated by reference to non-limiting  FIG. 7 . 
       FIG. 7  is a cross-sectional view along the primary axis of a cylindrical extrusion tool  18  comprising a first extrusion die  19  at the front end  20  of the extrusion tool  18  and a second extrusion die  21  at the back end  22  of the extrusion tool  18 . The first extrusion die  19  is connected to the second extrusion die  21  by an extrusion transfer channel  23  extending the length of the extrusion tool  18  from the first extrusion die  19  to the second extrusion die  21 . Cooling cavities  24  extend from the back end  22  of the extrusion tool  18  towards the front end  20  for a portion of the length of the extrusion tool  18  and beyond the second extrusion die  21 . In this configuration, a portion of the extrusion transfer channel  23  is adjacent to the cooling cavities  24 . The portion of the extrusion transfer channel  23  adjacent to the cooling cavities  24  comprises at least one opening  25  to each of the cooling cavities  24 , thereby exposing the inside of the extrusion transfer channel  23  to the cooling cavities  24 . The at least one opening  25  to each of the cooling cavities  24  may be any suitable shape such as, but not limited to, a square, rectangle, circle, triangle, and the like. 
     The portion of the extrusion transfer channel  23  adjacent to the cooling cavities  24  may comprise any desired number of openings  25  to each of the cooling cavities  24 . In one embodiment, the portion of the extrusion transfer channel  23  adjacent to the cooling cavities  24  may comprise one opening  25  to each of the cooling cavities  24 . In another embodiment, the portion of the extrusion transfer channel  23  adjacent the cooling cavities  24  may comprise two openings  25  to each of the cooling cavities  24 . In yet another embodiment, the portion of the extrusion transfer channel  23  adjacent to the cooling cavities  24  may comprise three openings  25  to each of the cooling cavities  24 . In still other embodiments, the portion of the extrusion transfer channel  23  adjacent to the cooling cavities  24  may comprise at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 openings  25  to each of the cooling cavities  24 . 
     Although  FIG. 7  depicts an extrusion tool  18  comprising two cooling cavities  24 , any suitable number of cooling cavities  24  may be used. In one embodiment, the extrusion tool  18  may comprise one cooling cavity  24 . In another embodiment, the extrusion tool  18  may comprise two cooling cavities  24 . In yet another embodiment, the extrusion tool  18  may comprise three cooling cavities  24 . In still another embodiment, the extrusion tool  18  may comprise four cooling cavities  24 . In other embodiments, the extrusion tool  18  may comprise at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, or at least 16 cooling cavities  24 . 
     The extrusion tool  18  further comprises cooling agent channels  26  extending from the back end  22  of the extrusion tool  18  for a portion of the length of the extrusion tool  18 . Any suitable number of cooling agent channels  26  may be used. For example, the extrusion tool  18  may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 cooling agent channels  26 , depending on the number of cooling cavities  24  and the size of the extrusion tool  18 . 
     The cooling agent channels  26  are attached to a cooling agent source. In one embodiment, the cooling agent may be water. In another embodiment, the cooling agent may be an oil. In yet another embodiment, the cooling agent may be an inert gas such as carbon dioxide, nitrogen, argon, and the like. In a further embodiment, the cooling agent may be a reactive gas chosen to form desirable compounds with the metal of the extrusion product. The cooling agent channels  26  open into the front end of the cooling cavities  24  through cooling ports  27 , which are configured such that the cooling agent comes into contact with the one or more openings  25  in the extrusion transfer channel  23 . In this configuration, as the first extruded product is extruded through the first extrusion die  19  and enters the portion of the extrusion transfer channel  23  adjacent to the cooling cavities  24 , the cooling agent running through the cooling channels  26  and through the cooling ports  27  comes into contact with the first extruded product through the openings  25  in the extrusion transfer channel  23 , thereby cooling the first extruded product. In one embodiment, the first extruded product may be cooled to a temperature below the melting point of the second metal material before being extruded through the second extrusion die  21 . 
     The cooling agent channels  26  are formed by drilling first channels  28  along the primary axis of the extrusion tool  18  from the back end  22  of the extrusion tool  18  towards the front end  20  of the extrusion tool  18  and bisecting second channels  29  perpendicular to the primary axis of the extrusion tool  18  from the outside perimeter  30  of the extrusion tool  18  into the cooling cavities  24 . The end of the second channels  29  along the outside perimeter of the extrusion tool  18  are sealed with plugs  31 . In one embodiment, the plug  31  may be a set screw. In another embodiment, the plug  31  may be a pipe plug. In yet another embodiment, the plug  31  may by a tapered plug. In still another embodiment, the plug  31 , may be a welded plug. In a further embodiment, the plug  31  may be a swaged plug. In still a further embodiment, the plug  31  may be a brazed plug. 
     In the embodiment according to  FIG. 7 , the cooling cavities  24  are shaped to accommodate the volume expansion of the cooling agent (e.g., water) when it comes into contact with the hot first extruded product. Each cooling cavity  24  further comprises an exit port  32 , which permits the release of excess pressure build-up as the cooling agent is heated by contact with the first extruded product. 
       FIG. 8  is an end-view of the back end  22  of the cylindrical extrusion tool  18 . The back end  22  of the extrusion tool  18  comprises the second extrusion die  21  and four exit ports  32  connected to four cooling cavities  24 . The back end  22  further comprises four inlets  33  to the cooling agent channels  26 , which are connected to the four cooling cavities  24 . The second extrusion die  21  comprises an extrusion exit  34 . 
       FIG. 9A  is an end-view of the second extrusion die  21  comprising an extrusion exit  34  and a die extrusion channel  35 . The second extrusion die  21  may optionally comprise one or more jacking bolts  28  to facilitate the removal of the second extrusion die  21  from the extrusion tool  18  for maintenance.  FIG. 9B  is a side view of the second extrusion die  21  comprising a die extrusion channel  35  and an extrusion exit  34 . 
       FIG. 10A  is a cross-sectional view of the extrusion tool  18  depicting the cooling cavities  24  of the extrusion tool  18 . The extrusion tool  18  comprises four cooling cavities  24  disposed radially from the central extrusion transfer channel  23 . The extrusion transfer channel  23  comprises an opening  25  into each cooling cavity  24  such that the inside of the extrusion transfer channel  23  is exposed to each of the four cooling cavities  24  through an opening  25 . The extrusion tool  18  further comprises four cooling channels  26 .  FIG. 10B  is the same cross-section view of the extrusion tool  18  containing an extruded product  36  disposed in the extrusion transfer channel  23 . In this configuration, the extruded product  36  is exposed to the cooling agent in each of the cooling cavities  24  through openings  25  such that the extruded product  36  can be cooled before being extruded through the second extrusion die  21 . 
       FIG. 11  is a cross-sectional view of a backing manifold  37  engaged in an extrusion press die holder  38 . The backing manifold  37  and die press holder  38  each comprise a container end  43 ,  44  and a free end  45 ,  46  and a cooling agent channel  39 ,  40  configured to connect to a cooling agent source through the side of the die press holder  38  to the container end  43  of the backing manifold  37 . The backing manifold  37  comprises manifold exits  41 , which permit the cooling agent to exit the extrusion tool  18 . The backing manifold  37  further comprises an extrusion exit  42 . In one embodiment, the backing manifold  37  is submerged under water. In another embodiment, the backing manifold  37  is submerged under an oil. The container end  43  of the backing manifold  37  comprises two outer notches  47  which form a cooling agent reservoir  48  when the backing manifold  37  is engaged against the extrusion tool  18 . The container end  43  of the backing manifold  37  comprises two inner notches  49  which form a cooling agent exit channel  50  when the backing manifold  37  is engaged against the extrusion tool  18 . The cooling agent exit channel  50  is connected to the manifold exits  41 . 
       FIG. 12  is an end-view of the free end of the backing manifold  37  and the extrusion press die holder  38 . The backing manifold  37  comprises eight manifold exits  41  radially spaced around the central extrusion exit  42 . In accordance with the present disclosure, any number of manifold exits  41  may be used. For example, the backing manifold  37  may comprise from about 4 to about 16 manifold exits  41 . In another embodiment, the backing manifold  37  may comprise from about 6 to about 14 manifold exits  41 . In a further embodiment, the backing manifold  37  may comprise from about 8 to about 12 manifold exits  41 . In still other embodiments, the backing manifold  37  may comprise about 1, about 2, about 3, about 4, about 5, about 6, about 7, about 8, about 9, about 10, about 11, about 12, about 13, about 14, about 15, about 16, about 17, about 18, about 19, about 20, about 21, about 22, about 23, about 24, about 25, about 26, about 27, about 28, about 29, about 30, about 31, about 32, about 33, about 34, about 35, about 36, about 37, about 38, about 39, about 40, about 41, about 42, about 43, about 44, about 45, about 46, about 47, or about 48 manifold exits  41 . The cooling agent reservoir  48  formed by the two outer notches  47  and the cooling agent exit channel  50  formed by the two outer notches  49  are also shown with dashed lines. 
     In one embodiment, an extrusion press is provided wherein the extrusion press comprises a ram, a container, a load carrier as described herein, a dummy block, an extrusion tool as described herein, a backing manifold, and a die block holder. In one embodiment, the extrusion tool is configured to be positioned entirely within the container of the extrusion tool. In another embodiment, the extrusion tool is configured to be positioned such that at least a portion of the extrusion tool is positioned within the container of the extrusion tool. In a further embodiment, the extrusion tool is configured to be positioned entirely outside of the container of the extrusion press. 
       FIG. 13  is a cross-section view of an extrusion press container  51  comprising a central extrusion chamber  52 , a dummy block  53 , a load carrier  1  as described herein, and an extrusion tool  18  as described herein. The backing manifold  37  as described herein is engaged in the extrusion press die holder  38  and against the extrusion tool  18 . In this configuration, the two outer notches  47  in the container end  43  of the backing manifold  37  forms the cooling agent reservoir  48 , which distributes the cooling agent in a ring around the extrusion tool  18  and provides cooling agent to the inlets  33  of the cooling agent channels  26 . The cooling agent reservoir  48  may be sealed in any suitable manner. In one embodiment, the cooling agent reservoir  48  may be sealed by o-rings. In another embodiment, the cooling agent reservoir  48  may be sealed by gaskets. In a further embodiment, the cooling agent reservoir  48  may be sealed by a metal-to-metal fitting. The two inner notches  49  in the container end  43  of the backing manifold  37  forms the cooling agent exit channel  50 , which distributes the cooling agent exhaust in a ring around the extrusion tool  18  and provides a passthrough of the cooling agent exhaust to the manifold exits  41 . 
     In another embodiment, a process for dual-phase hot metal extrusion comprises the steps of: (i) providing a load carrier as described herein; (ii) heating the load carrier to a temperature above the melting point of the second metal material and suitable for extrusion of the load carrier; (iii) equipping the container of an extrusion press with an extrusion tool comprising a first die, a second die, and at least one cooling cavity, as described herein; (iv) providing a cooling agent to the at least one cooling cavity; and (v) extruding the load carrier through the first extrusion die and then through the second extrusion die. 
     The extrusion products contemplated herein may be used as thermal and/or electrical conductors in any desirable product, process, or application. For example, the extrusion products contemplated herein may be used in consumer products (such as electronics, appliances, and the like), industrial equipment (such as motors, generators, commutators, and the like), and construction (such as window frames, supports, and the like). 
     The following examples are included to illustrate certain embodiments. Those of skill in the art should, however, in light of the present disclosure, appreciate that modifications can be made in the specific embodiments that are disclosed and still obtain a like or similar result without departing from the spirit and scope of the invention. Therefore, all matter set forth in these examples is to be interpreted as illustrative and shall not be construed as limiting in any way. 
     Example 1 
     A load carrier was formed from a cylindrical billet of UNS C10200 copper about 6 inches in diameter and about 9 inches in length. The billet was milled using a drill bit to form a load carrier containing twenty-five load chambers. A central load chamber was milled along the central axis of the billet. Twelve load chambers were milled 0.75 inches from the central chamber, each of the twelve load chambers being radially spaced 30° apart. An additional twelve load chambers were milled 1.5 inches from the central chamber, each of these twelve load chambers again being radially spaced 30° apart. Each of the twenty-five load chambers had a depth of between about 4 inches to about 6 inches. 
     The load carrier and twenty-five fluted spacers, aluminum cylinders, non-fluted spacers, and set screws were ultrasonically cleaned with soap and water, rinsed with water followed by alcohol, and then dried. A fluted spacer containing three flutes was placed in each of the load chambers. The bottom end of the fluted spacer was shaped to match the shape of the drill bit used to mill the load chambers. An aluminum cylinder (6006 aluminum rod) sized to fit in the load chambers was then loaded onto each fluted spacer in each load chamber. The flutes in the fluted spacers were sized to accommodate the increase in volume of aluminum in the load chamber caused by thermal expansion of the aluminum upon heating. A non-fluted spacer was then loaded into each load chamber and then deformed with hammering to form a tight seal within each load chamber. A set screw was then tightened in each load chamber such that the set screw was recessed from the top surface of the load carrier. 
     Example 2 
     The load carrier containing aluminum produced in Example 1 was heated to an internal temperature of approximately 1600° F., the recommended extrusion temperature of CNS C10200 copper, in a gas furnace. The internal temperature was monitored by a thermocouple placed in the center of a separate UNS C10200 copper billet also present in the furnace. Although this example used a gas furnace to heat the load carrier, induction is also an acceptable method for heating the load carrier. Upon reaching the desired internal temperature, the load carrier was then transferred to a hot extrusion press and immediately extruded through a flow die and into water. The extruded copper material was then drawn to form a rod. 
     Microscopic evaluation confirmed that the drawn copper rod contained twenty-five filaments, one central filament and an inner and outer ring each containing twelve filaments, of aluminum running axially within the copper rod. 
     Example 3 
     A load carrier was formed from a cylindrical billet of UNS C10200 copper about 6 inches in diameter and about 9 inches in length. The billet was milled using a drill bit to form a load carrier containing thirty-seven load chambers. After ultrasonic cleaning of all parts, a non-fluted spacer was placed in the bottom of each load chamber. These non-fluted spacers were shaped to substantially eliminate any void space created by the shape of the drill bit. A portion of the extruded copper rod obtained in Example 2 was then loaded into the load chamber followed by a second spacer, which was then deformed with hammering to form a tight seal within each load chamber. A set screw was then tightened in each load chamber such that the set screw was recessed from the top surface of the load carrier. 
     The load carrier was then heated to an internal temperature of approximately 1600° F. using a gas furnace. Upon reaching the desired internal temperature, the load carrier was then transferred to a hot extrusion press and was immediately extruded through a flow die and into water. The extruded copper material was then drawn to form a rod. 
     Microscopic evaluation confirmed that the drawn copper rod contained thirty-seven sets of twenty-five aluminum filaments running axially within the copper rod. 
     Example 4 
     The load carrier formed in Example 1 is heated to an internal temperature of approximately 1600° F., the recommended extrusion temperature of CNS C10200 copper, in a gas furnace. While the load carrier reaches temperature, an extrusion press is equipped with an extrusion tool comprising a first die, a second die, and four cooling cavities positioned therebetween, as described herein. The four cooling cavities are attached to a water source. Upon reaching the desired internal temperature, the load carrier is transferred to the hot extrusion press, and extrusion through the first die is immediately commenced. Upon the commencement of extrusion, the water source is powered to provide water to the four cooling cavities such that the load carrier is extruded through the first die is cooled to a temperature of about 1200° F. or less and is then extruded through the second die to form a copper rod comprising twenty-five filaments of aluminum extending axially through a portion of the copper rod. 
     When introducing elements of the various embodiment(s) of the present disclosure, the articles “a”, “an”, “the” and “said” are intended to mean that there are one or more of the elements. The terms “comprising”, “including”, “containing”, and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. 
     The use of individual numerical values are stated as approximations as though the values were preceded by the word “about” or “approximately”. Similarly, the numerical values in the various ranges specified in this application, unless expressly indicated otherwise, are stated as approximations as though the minimum and maximum values within the stated ranges were both preceded by the word “about” or “approximately”. In this manner, variations above and below the stated ranges can be used to achieve substantially the same results as values within the ranges. As used herein, the terms “about” and “approximately” when referring to a numerical value shall have their plain and ordinary meanings to a person of ordinary skill in the art to which the disclosed subject matter is most closely related or the art relevant to the range or element at issue. The amount of broadening from the strict numerical boundary depends upon many factors. For example, some of the factors which may be considered include the criticality of the element and/or the effect a given amount of variation will have on the performance of the claimed subject matter, as well as other considerations known to those of skill in the art. As used herein, the use of differing amounts of significant digits for different numerical values is not meant to limit how the use of the words “about” or “approximately” will serve to broaden a particular numerical value or range. Thus, as a general matter, “about” or “approximately” broaden the numerical value. Also, the disclosure of ranges is intended as a continuous range including every value between the minimum and maximum values plus the broadening of the range afforded by the use of the term “about” or “approximately.” Consequently, recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. 
     While several embodiments of the present teachings have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the functions and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the present teachings. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the present teachings described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, the present teachings may be practiced otherwise than as specifically described and claimed. The present teachings are directed to each individual feature and/or method described herein. In addition, any combination of two or more such features and/or methods, if such features and/or methods are not mutually inconsistent, is included within the scope of the present teachings. 
     The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles described herein can be applied to other embodiments without departing from the spirit or scope of the invention. Thus, it is to be understood that the description and drawings presented herein are representative of the subject matter which is broadly contemplated by the present invention. It is further understood that the scope of the present invention is not intended to be limited to the embodiment shown herein but is to be accorded the widest scope consistent with the patent law and the principles and novel features disclosed herein. 
     Alternative embodiments of the claimed disclosure are described herein. Of these, variations of the disclosed embodiments will become apparent to those of ordinary skill in the art upon reading the foregoing disclosure. The inventors expect skilled artisans to employ such variations as appropriate (e.g., altering or combining features or embodiments), and the inventors intend for the invention to be practiced otherwise than as specifically described herein. 
     Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.