Patent ID: 7951468

Claim:
A multiple layer ingot product comprising: an ingot having a base aluminum alloy layer and at least a first additional aluminum alloy layer disposed directly on the base layer; wherein the base layer has a first aluminum alloy composition; wherein the first additional aluminum alloy layer has a second aluminum alloy composition; wherein the first aluminum alloy composition and the second aluminum alloy composition are different; wherein no oxide layer exists between the base layer and the first additional aluminum alloy layer directly disposed on the base layer; wherein the multiple layer ingot product is made by the following steps comprising: casting the base aluminum alloy by a planar unidirectional solidification casting process; and applying the first additional aluminum alloy layer in the molten state directly to at least an upper molten portion of the base aluminum alloy layer, wherein the first additional aluminum alloy is also made by a planar unidirectional solidification casting process.