Mg-Zn-Si体系的相平衡计算及应用  

Thermodynamic Calculation of Phase Equilibria in the Mg-Zn-Si System and Its Application

作　　者：赵阳子[1] 赵云鹤[1] 李谦[1] 陈双林[1,2] 张捷宇[1] 周国治[1,3] 

机构地区：[1]上海大学上海市现代冶金及材料制备重点实验室 [2]Compu Therm,LLC,Madison,WI53719,USA [3]北京科技大学

出　　处：《稀有金属材料与工程》2010年第8期1385-1389,共5页Rare Metal Materials and Engineering

基　　金：国家科技支撑计划(2007BAE09B03);贵州省"十一五"重大专项(20066003);中国铝业公司科技发展基金(2007KJA07)

摘　　要：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 the Mg-Si binary system was re-assessed by the Calphad approach.Combined the thermodynamic data of Mg-Zn and Zn-Si binary systems,the thermodynamic parameters of Mg-Zn-Si ternary system were obtained by extrapolation.Based on the phase diagram of Mg2Si-MgZn2 pseudo-binary system,the liquid ternary interaction parameters of Mg-Zn-Si system were assessed.The results show that the calculated phase diagram agrees basically with the experimental data.The solidification process of the Mg-2.33Zn-0.9Si（at%） alloy was simulated by Scheil model,and the phase evolution of Mg alloy during cooling casting was predicted.The results agree with the previous experiment results.

关 键 词：Mg-Zn-Si系 热力学计算 相图计算 凝固 

分 类 号：TG113.14[金属学及工艺—物理冶金]