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3.3 Al-Si-Mg系合金的组织与机械性能此系中JIS实用合金有AC4A、AC4C和AC4CH。它们都是铸造性能良好的Al-Si合金中添加了少量的Mg,由于Mg_2Si中间相析出的热处理效果提高了强度。Mg量略微多一点的AC4C具有高的强度、良好的铸造性和耐蚀性。为了防止Fe的坏影响,通常加入Fe量的50～80％的Mn。在此系合金中,多使用较纯的Al-Si-Mg系AC4C(AA356)和Fe含量控制在0.20％以下提高韧性的AC全CH(AAA356),但后者大量用作汽车轮子。在铸件用的合金中,它们虽属中等强度的,但延伸率高、韧性
3.3 The microstructure and mechanical properties of Al-Si-Mg alloys In this system, JIS practical alloys are AC4A, AC4C and AC4CH. All of them have a small amount of Mg added to the Al-Si alloy with good castability, and the strength is enhanced due to the heat treatment effect of precipitation of the Mg 2 Si mesophase. AC4C with a little more Mg has high strength, good castability and corrosion resistance. In order to prevent the bad influence of Fe, Mn of 50-80% of the amount of Fe is usually added. In this alloy, more pure Al-Si-Mg-based AC4C (AA356) and AC full-CH (AAA356) whose Fe content is controlled below 0.20% to improve toughness are mostly used, but the latter are widely used as automobile wheels. In the casting alloy, although they are moderate strength, but the elongation rate, toughness