利用一系列不同Ｎｂ含量的ＴｉＡｌ合金研究了该体系的相关系及组织特征。在含有２０ａｔ％Ｎｂ的合金中发现１个新的γ１相。在含有１１ａｔ％Ｎｂ的ＴｉＡｌ合金中，由于Ｎｂ原子的进一步有序化，在衍射图上出现Ｌｌ０结构的超斑点。在具有过化学计量比Ａｌ含量的ＴｉＡｌ合金中，随着合金中Ｎｂ含量增加，Ｎｂ不断地取代Ｔｉ，合金由Ｌｌ０结构转变为进一步有序化的γ１相，是一个连续有序化过程。并讨论了可能的转变特征。 A series of TiAl alloys with different Nb contents were used to study the phase relationship and microstructure of the system. A new γ1 phase was found in the alloy containing 20at% Nb. In the TiAl alloy containing 11at% Nb, due to the further ordering of the Nb atoms, hyper-speckles of the L10 structure appear on the diffractogram. In the TiAl alloy with stoichiometric Al content, Nb continuously replaces Ti with the increase of Nb content in the alloy, and the alloy changes from Ll0 structure to further ordered γ1 phase, which is a continuous ordering process. And discussed the possible transitional features.