采用正交实验法和金相、力学性能、扫描电镜、能谱等测试手段对自主研发的变形Al-Si-Cu-Mg合金进行固溶和时效强化研究,并探究热处理过程中其组织特征的变化规律.结果表明:通过固溶(495℃,90 min,水冷)和时效(170℃,4h,空冷)处理后,合金的硬度提高31.3％,强度提高3.3倍.固溶过程中,大量Si、Cu和Mg原子固溶于基体中,起到强烈的固溶强化作用;过剩的共晶Si逐渐发生明显粒状化;剩余的大块θ相和Q相发生球化.时效过程中,细小针状强化相θ”和细小板条状Q'相在基体的(100)面上大量析出,分布均匀,对合金起到强烈的沉淀强化效果;过剩Si主要通过扩散附着于共晶Si表面析出.
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