Metal Alloy Compositions And Process Background Of The Invention

Patent · Tue Nov 11 00:00:00 EST 2003

OSTI ID:879759

Flemings, Merton C ^[1]; Martinez-Ayers, Raul A ^[2]; de Figueredo, Anacleto M ^[3]; Yurko, James A ^[4]

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1. Cambridge, MA
2. Somerville, MA
3. Newton, MA
4. Boston, MA

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.

• Research Organization: WORCESTER POLYTECHNIC INST
• DOE Contract Number: FC07-98ID13618
• Assignee: Massachusetts Institute of Technology (Cambridge, MA)
• Patent Number(s): US 6645323
• Application Number: 10/104536
• OSTI ID: 879759
• Country of Publication: United States
• Language: English