Thixocasting process, and thixocasting aluminum alloy material

Details Thixocasting process, and thixocasting aluminum alloy material Thixocasting process, and thixocasting aluminum alloy material

1996-10-09

1999-11-30

Ryan, Patrick

Metal treatment

Stock

Aluminum base

148437, 148688, 420544, 420542, 420528, 420548, C22C 2100

Patent

active

059935723

ABSTRACT:
In a thixocasting process, the following steps are used: a step of subjecting, to a heating treatment, an Al-Si based alloy material having a hypo eutectic crystal composition and a characteristic that a first angled endothermic section appearing due to the melting of a eutectic crystal and a second angled endothermic section appearing due to the melting of a component having a melting point higher than a eutectic point exist in a differential calorimetric curve, thereby preparing a semi-molten Al-Si based alloy material having solid and liquid phases coexisting therein; a step of pouring the semi-molten Al-Si based alloy material into a cavity in a casting mold under pressure; and a step of solidifying the semi-molten Al-Si based alloy material under pressure. When the temperature of a rise-start point in the first angled endothermic section is represented by T.sub.1, and the temperature of a drop-end point the first angled endothermic sections is represented by T.sub.2, the casting temperature T for the semi-molten Al-Si based alloy material is set in a range of T.sub.1 .ltoreq.T.ltoreq.T.sub.2. Thus, the fine precipitation of a primary crystal Si phase can be realized to provide an increase in strength of an aluminum alloy cast product.

REFERENCES:
patent: 3031299 (1962-04-01), Criner
patent: 3926690 (1975-12-01), Morris et al.
patent: 5178686 (1993-06-01), Schmid et al.

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