| 摘要 |
PROBLEM TO BE SOLVED: To develop a high toughness aluminum alloy casting capable of substituting for AC4CH, satisfying cost effectiveness as well as castability and moreover having tensile strength of >=380 Mpa, elongation of >=9%, 0.2% proof stress of 200 Mpa and impact value of >=90 kJ/m2. SOLUTION: This alloy casting has a composition containing 3.5 to 4.3% Cu, 5.0 to 7.5% Si, 0.10 to 0.25% Mg, <=0.2% Fe and <=0.0003% P, and the balance Al with inevitable impurities. |
