Al-3.5Cu-7.0Si铸造铝合金在固溶处理过程中,随固溶处理时间的延长,时效后的强度显著增加.两次强度增加分别发生在0-2小时和4-8小时,与铸态强度相比,其抗拉强度分别增加50～80MPa和约20MPa.金相观察及扫描电镜分析表明,第一次强度增加主要源于依附在杂质上的CuAl2相及基体中弥散的CuAl2相的溶解,硅相粒子的平滑化也对强度提高有一定作用;第二次强度增加则是由于块状CuAl2相开始溶解的贡献.该合金中的富铁化合物特别是β-FeSiAl5相非常稳定,通常的固溶处理难以使其溶解或改变其形状和分布.
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