| 摘要 |
To provide a high-strength, high-ductility cast aluminum alloy, which enables a near-net shape product to be produced by improving the casting structure of an aluminum alloy, particularly by using specific constituents and controlling the cooling rate, and a process for producing the same. The high-strength, high-ductility cast aluminum alloy of the present invention is characterized in that it has a structure comprising fine grains of alpha -Al, having an average grain diameter of not more than 10 mu m, surrounded by a network of a compound of Al-lanthanide-base metal, the alpha -Al grains forming a domain, that the domain comprises an aggregate of alpha -Al grains which have been refined, cleaved, and ordered in a single direction and that it has a composition represented by the general formula AlaLnbMc wherein a, b, and c are, in terms of by weight, respectively 75%</=a</=95%, 0.5%</=b<15%, and 0.5%</=c<15%.
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