采用相图计算的方法对Al-Zn-Mg-Cu系合金进行凝固路径、相分数的热力学计算模拟,并通过DSC,XRD和SEM手段进行实验验证.结果表明,Al-9.5Zn-2.0Mg-1.7Cu合金中由α(Al)、η(MgZn2)相、Al7Cu2 Fe和少量的θ(Al2Cu)组成,非平衡凝固路径的计算与实验结果相符合;Zn,Mg和Cu含量分别为9.5％,2.0％和1.7％(质量分数,下同)时,其η(MgZn2)相分数达到11.1％;可以将Cu/Mg=1作为合金设计时能否形成一定量θ(Al2Cu)的判据.
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