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Metal composition and methods for preparing liquid-solid alloy metal composition and for casting the metal compositions
R. Mehrabian,Merton C. Flemings +1 more
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TLDR
In this paper, a composite composition comprising a metallic matrix having a concentration of third phase solid particles homogeneously dispersed throughout the metallic matrix is presented. But 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 matrices.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.read more
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Fine grained metal composition
Abstract: A fine grained metal composition suitable for forming in a partially solid, partially liquid condition. The composition is prepared by producing a solid metal composition having an essentially directional grain structure and heating the directional grain composition to a temperature above the solidus and below the liquidus to produce a partially solid, partially liquid mixture containing at least 0.05 volume fraction liquid. The composition, prior to heating, has a strain level introduced such that upon heating, the mixture comprises uniform discrete spheroidal particles contained within a lower melting matrix. The heated alloy is then solidified while in a partially solid, partially liquid condition, the solidified composition having a uniform, fine grained microstructure.
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Thermal flow simulation for casting/molding processes
TL;DR: In this article, a method for simulating the behavior of an incompressible, viscous fluid in a casting/molding process is presented, which uses classical fluid dynamic equations and control volume-finite element techniques to solve for the momentum and energy of the fluid.
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Casting, thermal transforming and semi-solid forming aluminum alloys
TL;DR: In this paper, a process for casting, thermally transforming and semi-solid forming an aluminum base alloy into an article is described, the process comprising the steps of: casting a molten body of aluminum base Alloy to provide a solidified body, the molten aluminium base alloy being solidified at a rate between liquidus and solidus temperatures of the aluminium base Alloy in a range of 5° to 100° C/sec.
Patent
Machinable metal-matrix composite and liquid metal infiltration process for making same
Alexander M. Brown,Eric Klier +1 more
TL;DR: In this paper, the authors present a method for machinable metal-matrix composites with high-speed steel bit for greater than about 1 minute without excessive wear occurring to the bit.
Patent
Method and apparatus for manufacturing metallic parts by fine die casting
TL;DR: Injection molding as discussed by the authors, the melted metal is maintained in a liquid state throughout the system, and a piston in a second chamber first retracts to create suction, assisting in drawing in the melting metal into the second chamber from the first chamber and evacuating gas.
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Method of producing a lightweight foamed metal
Glenn W Peisker,Hardy Paul W +1 more
TL;DR: In this article, a method for producing foamed metals or alloys in which the metallic substance is melted with a substance which produces a gas when heated to at least the melting temperature of the metallic material, followed by cooling, siliceous aggregate particles are dispersed in the melt to reduce the fluidity thereof.
Patent
Method for solidifying while rubbing the solid-liquid interface
TL;DR: The microstructure and the impurity distribution in a solid which has been directionally solidified from a melt or solution can be strongly influenced by rubbing the solid-liquid interface during solidification.