The influence of copper (Cu) on fluidity and hot tearing susceptibility (HTS) of Mg-7Zn-xCu (x = 0, 1, 2, 3) ternary alloys was studied by experimental investigation and simulation assessment. The experimental investigations were carried out using bespoke fluidity and “T-shaped” hot tearing test molds. The microstructure and morphology were characterized by scanning electron microscopy system equipped with an energy dispersive spectroscopy system, and transmission electron microscope. The simulation assessment, which was carried out by using ProCAST software, focused on the solid fraction, phase fraction, and effective stress of the alloys during solidification. The solidification parameter obtained by DTA were used as input data to simulate HTS, the results shown a higher agreement with the experimental results than that obtained by simulation with the parameters from the software database. The results displayed that the fluidity increased and HTS decreased with Cu addition in the range from 0 to 3 wt.%. Moreover, the phase fraction of MgZnCu phase in Cu-containing alloys increased. The simulation results of HTS with DTA solidification parameters presented a higher agreement with the experimental results.

铜 (Cu) 对 Mg-7Zn- x Cu ( x= 0, 1, 2, 3) 通过实验研究和模拟评估研究了三元合金。实验研究是使用定制的流动性和“T 形”热撕裂测试模具进行的。微观结构和形貌通过配备能量色散光谱系统的扫描电子显微镜系统和透射电子显微镜进行表征。模拟评估使用 ProCAST 软件进行，重点关注合金在凝固过程中的固相分数、相分数和有效应力。以 DTA 得到的凝固参数作为输入数据对 HTS 进行模拟，结果与实验结果的吻合度高于用软件数据库中的参数模拟得到的结果。结果表明，随着Cu在0-3wt.%范围内的加入，流动性增加而HTS降低。此外，含Cu合金中MgZnCu相的相分数增加。具有 DTA 凝固参数的 HTS 模拟结果与实验结果具有较高的一致性。