采用基于CALPHAD法的热力学模拟对Al-xSi-yCu-zMg半固态高硅铝合金进行合金成分的优化设计.实验以元素Si、Cu、Mg为因变量,对Al-Si-Cu-Mg四元高硅铝合金进行热力学模拟,并用DSC测试分析验证模拟结果,对合金成分进行了优化.结果表明:Cu、Mg是合金设计的两个关键元素,能显著影响液相体积分数对温度的敏感度以及温度间隔,而Si元素对其影响较小.结合半固态合金热力学设计判据,Al-17Si-4.5Cu-1.5Mg、A1-17Si-5Cu-1Mg和Al-17Si-4Cu-2Mg是较理想的半固态触变成形用高硅铝合金.
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