本文对大晶粒FeAl金属间化合物超塑性变形的微观组织演变进行了研究，并测定了其超塑性变形激活能显微组织分析表明，合金的超塑性变形是一个晶粒变形、内部形成亚晶界、进而亚晶界向晶界转换，从而使晶粒得以细化的过程Fe－36．5Al，Fe－36.5Al-1Ti和Fe－36.5Al-2Ti合金变形激活能的测定值分别为370，290和260kJ·mol-1，大大低于其他的FeAl基合金的蠕变激活能，表明超塑性变形由亚晶界和晶界扩散控制 In this paper, the microstructure evolution of the superplastic deformation of the large grain FeAl intermetallic compounds was studied, and the microstructure analysis of the superplastic deformation activation energy of the alloy showed that the superplastic deformation of the alloy is a grain deformation, the formation of subgrain And then the subgrain boundary to the grain boundary, so that the grain refinement of the deformation of Fe-36.5Al, Fe-36.5Al-1Ti and Fe-36.5Al-2Ti alloy deformation activation values ​​were 370, 290 and 260 kJ · mol-1, which are much lower than the creep activation energy of other FeAl-based alloys, indicating that the superplastic deformation is controlled by the subgrain boundaries and grain boundary diffusion