金属间化合物FeAl超塑性变形中的位错特征

DISLOCATION FEATURES IN FeAl ALLOY AFTER SUPERPLASTIC DEFORMATION

利用透射电子显微镜研究了金属间化合物ＦｅＡｌ超塑性变形后的位错组态。研究结果表明，变形过程中原始大晶粒被亚晶粒分割，亚晶界对亚晶粒内部位错的吸收导致亚晶界向小角度晶界演化．同时，亚晶粒又可再次被亚晶界分割，重复上述演化过程。

The dislocation features in FeAl alloy after superplastic deformation have been investigated by TEM. The results show that the initial large grains are divided into small grains through the formation of sub-grain boundaries during the superplastic deformation,and the sub-grain boundaries can develop into small grain boundaries by absorbing the dislocations in sub-grains. Meanwhile, the new grains can be further divided by newly formed sub-grain boundaries. After repeating the above process of evolution, the initial large grains are fined and the superplastic deformation keeps going on.