研究了细晶 Ｔｉ３３ Ａｌ３ Ｃｒ０ ．５ Ｍｏ （ 质量分数） 合金在超塑性变形过程中的位错运动。透射电镜分析结果表明， 超塑性变形时， 合金中存在大量位错运动， 在晶界附近和晶粒内形成了位错网， 并在晶界上出现位错塞积。大多数位错是从晶界及α２ 相粒子处发射出来的。还发现了动态再结晶现象， 这种动态再结晶是由于位错的低可动性导致位错密度不断升高造成的。分析认为， 位错运动是 Ｔｉ Ａｌ 基合金超塑性变形过程的主要协调机理。 Studied the fine grain Ti  33 Al  3 Cr  0. Dislocation motion of 5 Mo (mass fraction) alloy during superplastic deformation. Transmission electron microscopy results show that during the superplastic deformation, there are a lot of dislocation motions in the alloy, forming a dislocation network near the grain boundaries and dislocations in the grain boundaries. Most dislocations are emitted from grain boundaries and α2 phase particles. A dynamic recrystallization was also found due to the low dislocation mobility that resulted in a continual increase in dislocation density. The analysis shows that dislocation movement is the main coordination mechanism of the superplastic deformation process of TiAl-based alloys.