采用Thermo-Calc软件计算和光学显微镜、扫描电镜、能谱仪及示差扫描量热仪实验分析手段,研究了Al-Zn-Mg-Cu系富铝角等温(480℃)截面图和Al-12Zn-xMg-1.5Cu合金的垂直截面图.结果表明,相平衡计算结果与实验分析吻合良好.在等温等锌截面计算相图中,随着Zn含量提高,α(Al)单相区和α(Al)+ S(Al2CuMg)相区分别缩小和扩大,在α(Al)单相区内,Mg在铝固溶体的固溶度降低,Cu的固溶度变化不大.在等温等铜截面计算相图中,随着Cu含量降低,α(Al)单相区扩大,α+S(Al2CuMg)两相区缩小.合金元素的极限固溶度对温度极为敏感,在多相共晶点附近温区,合金元素的极限固溶度最大.
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