| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Si alloy casting having superior toughness and stress corrosion cracking resistance, which minimizes an amount of primary crystal Si in a liquid-phase-solidified region corresponding to a liquid phase, and prevents the occurrence of segregation. SOLUTION: The Al-Si alloy casting is made by solidifying an Al-Si alloy material in which a solid phase and the liquid phase coexist. The Al-Si alloy material comprises 6.5 wt.% to 7.5 wt.% Si, 0.5 wt.% to 1.5 wt.% Cu, 0.4 wt.% to 0.5 wt.% Mg, less than 0.2 wt.% Ti and the balance Al (containing unavoidable impurities). The Al-Si alloy casting contains, by volume fraction Vf, 40% to 60% solid-phase solidified region S<SB>S</SB>corresponding to the solid phase. COPYRIGHT: (C)2005,JPO&NCIPI
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