基于两种热力学数据获取方法(直接耦合Thermo-Calc相图计算法与调用拟合函数法)对Al-4Cu-6Si合金的凝固路径进行数值计算; 为验证这两种方法的正确性, 选取Al-15.05Cu-6.17Si合金进行凝固试验, 并将试验结果与计算结果进行对比。结果表明: Al-4Cu-6Si合金的凝固路径分为三个阶段, 即L+α → L+α+Si → L+α+θ+Si; 耦合Thermo-Calc相图计算法计算得到的初生相、两相共晶、三相共晶的体积分数分别为50.813%, 37.234%, 11.953%, 调用拟合函数法的计算结果分别为50.809%, 38.000%, 11.191%; 两种方法的计算精度比较接近, 但调用拟合函数法的计算效率更高, 运行时间仅为直接耦合Thermo-Calc相图计算法的1.21%; Al-15.05Cu-6.17Si合金的凝固试验验证了采用这两种热力学数据获取方法进行凝固路径计算的正确性。

Solidification path of Al-4Cu-6Si alloy was calculated based on two different thermodynamic data-acquisition methods: direct coupling with Thermo-Calc and calling regression functions. In order to verify the correctness of the above two kinds of methods, a parallel experimental investigation on Al-15.05Cu-6.17Si alloy was carried out to compare with calculation results. The results show that the solidification path of Al-4Cu-6Si alloy was L+α→L+α+Si→L+α+θ+Si. The volume fraction of primary phase, binary eutectic and ternary eutectic calculated by coupling with Thermo-Calc method were 50.813%, 37.234%, 11.953%, respectively, and the calculation results got by calling regression functions method were 50.809%, 38.000%, 11.191%. Comparing the calculation results from the two kinds of thermodynamic data-acquisition methods, it was found that the accuracy of the two methods was relatively close, but calling regression function method was much more efficient than coupling with Thermo-Calc method. The time of calling regression function method was 1.21% of coupling with Thermo-Calc method. The correctness for calculating solidification path through two different thermodynamic data-acquisition methods was demonstrated by using solidification experiment of Al-15.05Cu-6.17Si alloy.