Process for manufacturing spheroidal hypoeutectic aluminum alloy

Details Process for manufacturing spheroidal hypoeutectic aluminum alloy Process for manufacturing spheroidal hypoeutectic aluminum alloy

1989-12-01

1991-04-23

Dean, R.

Alloys or metallic compositions

Aluminum base

Silicon containing

148 1, 420590, C22C 100, C22C 102

Patent

active

050098446

ABSTRACT:
A semi-solid metal-forming process for producing an article of a hypoeutectic aluminum-silicon alloy comprises heating a solid billet of the alloy to a temperature intermediate the liquidus temperature and the solidus temperature at a rate not greater than 30.degree. C. per minute, preferably not greater than 20.degree. C. per minute, to form a semi-solid body of the alloy while inhibiting the formation of free silicon particles therein. The semi-solid body comprises a primary spheroidal phase dispersed in a eutectic-derived liquid phase and is conducive to forming at low pressure. In one apsect of this invention, a billet having a quiescently cast microstructure characterized by primary dendrite particles in a eutectic matrix is heated at the slow rate and maintained at the intermediate temperature for a time sufficient to transform the dendrite phase into the desired spheroidal phase.

REFERENCES:
patent: 4106956 (1978-08-01), Bercovici
patent: 4415374 (1983-11-01), Young et al.
patent: 4865808 (1989-09-01), Ichikawa et al.

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