中文摘要：

利用Miedema二元系统生成热模型和Kohler模型，建立计算三元合金各组分的活度系数模型，并利用该模型计算三元液态体系Cu—Sb—Zn、Cu—Sn—Zn、Ag—Cu—Ge、Al-Fe—Si和三元固态体系C—Fe—Co及C—Fe—Ni等组分的活度或活度系数，同时与有关实验值进行对比．结果表明，组分活度的计算值与实验值具有较好一致性．该模型仅依靠合金元素本身的物理参数，不仅适用于液态合金，对固态合金的组分活度也具有一定预测作用．

英文摘要：

Based on Miedema model for calculating the formation heat of binary system and Kohler＇s model, a new model was established for calculating activity coefficients in ternary alloys. The calculation resuits based on this new model for the activity coefficients agree well with the experimental data in liquid state systems including Cu-Sb-Zn, Cu-Sn-Zn, Ag-Cu-Ge, Al-Fe-Si and solid state systems including C-Fe- Co,C-Fe-Ni, which supports the validity of the proposed model. The advantage of the model is that, independent of experimental data, it is applicable to predict the activity coefficients for ternary alloys in solid state system as well as in liquid state system.