| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy casting having the mechanical strength and castability equivalent to or better than those of the conventional aluminum alloy casting and having further improved thermal conductivity and a method for manufacturing such aluminum alloy casting. SOLUTION: The aluminum alloy casting contains 6.0 to 8.0mass% Si, contains elements other than Si and Al at≤0.6%, is regulated in an amount of Si solid solution in an aluminum base phase to 0.5 to 1.1mass%, and is regulated in the area rate of the crystallized matter in the structure in the metal to 5 to 8%. Also, the amount of Si solid solution and the area rate of the crystallized matter are achieved by subjecting an aluminum alloy casting blank to one or more hours of a heating and holding treatment at 400 to 510°C after casting. COPYRIGHT: (C)2006,JPO&NCIPI
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