Loading patent…
AssigneeMassachusetts Institute of Technology
InventorsMerton C. Flemings, Raul A. Martinez-Ayers, Anacleto M. de Figueredo, James A. Yurko
Estimating the term…
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.
The method for forming a solid skinless metal composition free of entrapped gas and being derived from a liquid-solid composition comprising solid discrete degenerate dendrites homogeneously distribute a liquid phase of said metal composition, said solid discrete degenerate dendrites being substantially free of eutectics which comprises:
The method for forming a shaped skinless metal composition free of entrapped gas and having solid discrete degenerate dendrites homogeneously distributed within a liquid phase of said metal composition, said solid discrete degenerate dendrites being substantially free of eutectics which comprises:
Dependencies are inferred from the claim text.