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将Ａｌ－Ｓｉ－Ｆｅ三元合金熔体中组元Ａｌ的过剩偏摩尔自由能表达成多项式函数的形式，再由组成该三元系的三个二元子系以及三元系部分实验结果作为边界条件确定多项式中的参数Ａｊｋ值。根据Ｇｉｂｂｓ－Ｄｕｈｅｍ方程导出了计算体系过剩摩尔自由能多项式中的参数Ｆｊｋ值，由Ａｊｋ和Ｆｊｋ值求得组元Ｓｉ、Ａｌ的过剩偏摩尔自由能的表达式，并用上述解析表达式计算出了整个液相区域内各组元的等活度线
The excess partial molar free energy of the Al in Al-Si-Fe ternary alloy melt is expressed in the form of a polynomial function, and then the experimental results of the three binary and ternary systems composing the ternary system The boundary conditions determine the parameter Ajk in the polynomial. According to the Gibbs-Duhem equation, we derive the Fjk value of the excess molar free energy polynomial in the calculation system, and obtain the expression of the excess partial molar free energy of the Si and Al elements from Ajk and Fjk values. Using the analytical expression Isotopes of all components in the entire liquid region