研究了由多元系相平衡实验结果求得亚稳态边二元系相互作用参数的方法；依据ＴｉＡｌＮｂ三元系α／β相平衡实验数据，采用亚正规溶体模型，计算了ＡｌＮｂ二元系的α相相互作用参数ＩαＡｌＮｂ，并进行了检验．结果表明，这种方法是可行的． Based on the experimental data of the ternary α / β phase equilibrium of TiAlNb, the subnormalized solution model was used to calculate the Al  Nb binary system α-phase interaction parameters IαAlNb, and tested. The results show that this method is feasible.