中文摘要：

根据柯勒（Kolher）对称热力学模型,同时借助于米德玛（Midema）生成热模型,从热力学上推导出三元体系的计算公式,得出Ti6Al4V、Ti600、Superα2和Ti2AlNb4种基体合金系中各组元的活度系数以及活度相互作用系数,利用扩散系数的热力学因子和组元的示踪扩散系数及自扩散系数,进一步得到基体合金系中相关组元的互扩散系数。4种基体合金系中Ti元素的活度系数顺序为：γTiinTi6Al4V〉γTiinTi600〉γTiinsuperα2〉γTiinTi2AlNb,主要的合金元素Al在4种基体中的互扩散系数的顺序为：DAlinTi600〉DAlinTi6Al4V〉DAlinSuperα2〉DAlinTi2AlNb。

英文摘要：

Based on Kolher＇s ternary solution model and Miedema＇s model for calculating the heats of formation of ternary solution, the activity coefficients and activity interaction coefficients in Ti6A14V, Ti600, Super a2 and Ti2AlNb are obtained. According to thermo-dynamical factors in diffusion as well as the self-diffusion coefficients of alloying elements, the further step is to get the inter-diffusion coefficients. The activity coefficients of Ti in the four alloys are in the following order： γTiinTi6Al4V〉γTiinTi600〉γTiinsuperα2〉γTiinTi2AlNb,Ti in Ti2AlNb, and the order of inter-diffusion coefficients oral in the matrix is as follows： DAlinTi600〉DAlinTi6Al4V〉DAlinSuperα2〉DAlinTi2AlNb.