US 3,951,651 AGranted

Metal composition and methods for preparing liquid-solid alloy metal compositions and for casting the metal compositions

AssigneeMassachusetts Institute of Technology

InventorsRobert Mehrabian, Merton C. Flemings

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Abstract

This invention provides a composite composition comprising a metallic matrix having a concentration of third phase solid particles homogeneously dispersed throughout the metallic matrix. The metallic matrix can be liquid, solid or partially solid and can have (a) a dendritic structure or (b) up to 65 weight percent of a structure comprising degenerate dendritic or nodular primary discrete solid particles suspended in a secondary phase having a lower melting point than the primary particles which secondary phase can be solid or liquid. The third phase particles can be metallic, non-metallic or a combination metallic-nonmetallic compositions and have a surface composition which is not wet by the metallic matrix when the matrix is a liquid.

Claims15

Dependent claims

The method for forming a metal composition comprising a metal alloy matrix and solid particles homogeneously suspended in said matrix, said solid particles having a composition different from said alloy and having a surface composition that is not wet by the metal alloy when said metal alloy is liquid which comprises

a. heating a metal alloy to form a liquid-solid mixture of said alloy wherein less than about 65 weight percent thereof is solid,
b. vigorously agitating said liquid-solid mixture to convert the solid therein to discrete degenerate dendrites derived from said metal alloy, said degenerate dendrites comprising up to about 65 weight percent of the heated metal alloy and wherein the remainder of the heated metal alloy is liquid,
c. adding said solid particles to said heated metal alloy containing said degenerate dendrites and
d. dispersing said solid particles homogeneously in said heated metal alloy containing degenerate dendrites, said solid particles being added in an amount up to about 65 weight percent based upon the weight of metal alloy and degenerate dendrites.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 05/379,990Filed 17 Jul 1973 · continuation in part
Priority: 7 Aug 1972
Granted: 20 Apr 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B22D 1/00
Treatment of fused masses in the ladle or the supply runners before
C22C 1/026
By melting: alloys based on aluminium
C22C 1/1036
Alloys containing non-metals: starting from a melt
C22C 1/12
Making non-ferrous alloys: by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase