对三元系不同结构相平衡进行了巨势法分析,确定了三元系不同结构相平衡的巨势法计算方法.采用亚正规溶体模型描述TTi-Al-Nb三元系中α,β和γ相的Gibbs自由能,由Ti-Al,Al-Nb和Nb-Ti二元系及Ti-Al-Nb三元系相平衡数据,计算了相互作用参数IαAINb,IαNbTi,IβTiAl,IβAINb,IβNbTi,IγNiAl,IγAlNb和IγNbTi.利用获得的热力学参数,运用巨势法对Ti-Al-Nb三元系1423-1673 K范围内α/β及α/γ相平衡进行了计算.计算结果与实测相图吻合得很好,证明本方法是可行的,获得的相互作用参数值是合理的.
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