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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、Al7Cu2Fe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。
The thermodynamic calculations of the solidification path and phase fraction of Al-Zn-Mg-Cu alloy were carried out by phase diagram calculation. The experimental results were verified by DSC, XRD and SEM. The results show that the Al-9.5Zn-2.0Mg-1.7Cu alloy consists of α (Al), η (MgZn2) phase, Al7Cu2Fe and a small amount of θ (Al2Cu). The calculation of the non-equilibrium solidification path is consistent with the experimental results. , The η (MgZn2) phase fraction reaches 11.1% when the contents of Mg and Cu are 9.5%, 2.0% and 1.7% (mass fraction, respectively), and it can be determined whether Cu / Mg = The criterion of the quantity θ (Al2Cu).