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Metal alloy compositions and process

United States Patent

November 11, 2003
View the Complete Patent at the US Patent & Trademark Office
A skinless metal alloy composition free of entrapped gas and comprising primary solid discrete degenerate dendrites homogeneously dispersed within a secondary phase is formed by a process wherein the metal alloy is heated in a vessel to render it a liquid. The liquid is then rapidly cooled while vigorously agitating it under conditions to avoid entrapment of gas while forming solid nuclei homogeneously distributed in the liquid. Agitation then is ceased when the liquid contains a small fraction solid or the liquid-solid alloy is removed from the source of agitation while cooling is continued to form the primary solid discrete degenerate dendrites in liquid secondary phase. The solid-liquid mixture then can be formed such as by casting.
Flemings; Merton C. (Cambridge, MA), Martinez-Ayers; Raul A. (Somerville, MA), de Figueredo; Anacleto M. (Newton, MA), Yurko; James A. (Boston, MA)
Massachusetts Institute of Technology (Cambridge, MA)
10/ 104,536
March 25, 2002
The Government has rights in this invention pursuant to Contract No. DE-FC-07-98ID13618 awarded by the Department of Energy.