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利用Calphad方法重新评估了Mg-Si二元系的液相,并结合Mg-Zn和Zn-Si二元系热力学数据,外推得到Mg-Zn-Si三元系热力学参数;同时根据Mg2Si-MgZn2伪二元相图实验数据评估了Mg-Zn-Si系的液相三元相交互作用参数,计算相图与实验数据较一致。利用Scheil凝固模型模拟了Mg-2.33Zn-0.9Si(at%)合金的凝固过程,预测了镁合金在铸造冷却过程中的相演变信息,模拟计算结果与实验结果吻合较好。
The liquid phase of Mg-Si binary system was re-evaluated by Calphad method. The thermodynamic parameters of Mg-Zn-Si ternary system were extrapolated based on the thermodynamic data of Mg-Zn and Zn-Si binary systems. Pseudo-binary phase diagram experimental data to evaluate the Mg-Zn-Si system of liquid phase ternary interaction parameters, the calculated phase diagram and the experimental data more consistent. The solidification process of Mg-2.33Zn-0.9Si (at%) alloy was simulated by Scheil solidification model, and the phase evolution information of magnesium alloy during casting cooling was predicted. The calculated results are in good agreement with the experimental results.