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研究了超塑性Ｔｉ－３３Ａｌ－３Ｃｒ－０．５Ｍｏ（质量分数，％）合金中孔洞的形成和发展过程及其与合金的断裂之间的关系．研究结果表明，ＴｉＡｌ基合金在超塑性变形过程中产生的孔洞有３种类型，它们分别形成于三叉晶界处、晶界上和晶粒内．三叉晶界上的孔洞一般呈Ｖ型，而晶界和晶内的孔洞则呈圆形或椭圆形．分析认为，孔洞的长大、扩展和聚集是造成ＴｉＡｌ基合金超塑性拉伸断裂的主要原因．
The formation and development of pores in the superplastic Ti-33Al-3Cr-0.5Mo (mass fraction) alloy were studied and the relationship between the fracture and the alloy was investigated. The results show that there are three types of pores in the superplastic deformation of TiAl-based alloys, which are formed at the trigeminal boundaries, the grain boundaries and the grains. The trigeminal hole on the hole is generally V-shaped, and grain boundaries and intracrystalline holes were round or oval. The analysis shows that the growth, expansion and accumulation of holes are the main reasons for the superplastic tensile fracture of TiAl-based alloys.