Patent ID: 6464806
Filing Date: 2002-10-15
Classification: B21C,C22F,H01L,Y10S,Y10T

Abstract:
A method of forming nano-scale extruded structures from a polycrystalline material, the method comprising the steps of:forming a structure comprising a polycrystalline material constrained by a constraining material in all directions but one direction, the polycrystalline material having a surface that is normal to the one direction; and then selectively heating the polycrystalline material during which the constraining material restricts thermal expansion of the polycrystalline material in all directions but the one direction normal to the surface of the polycrystalline material, such that stresses are induced in the polycrystalline material that cause grain growth from the surface of the polycrystalline material in the one direction, the grain growth producing at least one nano-scale extruded structure projecting above the surface of the polycrystalline material.