Casting thermal transforming and semi-solid forming aluminum all

Details Casting thermal transforming and semi-solid forming aluminum all Casting thermal transforming and semi-solid forming aluminum all

1997-09-02

1999-10-19

Yee, Deborah

Metal treatment

Stock

Aluminum base

148438, 148439, C22C 2102, C22C 2100

Patent

active

059682922

ABSTRACT:
A billet of an aluminum alloy for thermally transforming from a dendritic microstructure to a globular structure and for forming in a semi-solid condition into a shaped aluminum alloy article; the billet having a dendritic microstructure having a grain size in the range of 20 to 250 .mu.m provided by a solidification rate in the range of 5.degree. to 100.degree. C./sec between liquidus and solidus temperatures when the aluminum alloy is cast into billet; the billet having a dendritic microstructure thermally transformable to the globular structure or non-dendritic structure by heat applied to the billet at a heat-up rate greater than 30.degree. C. per minute to a superheated temperature of 3.degree. to 50.degree. C. above solidus temperature of the aluminum alloy; the billet in the globular structure or non-dendritic structure and in the semi-solid condition having the ability to be formed into the shaped aluminum article.

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