SUPERPLASTIC DEFORMATION OF TiAl BASED ALLOY

来源期刊：中国有色金属学报(英文版)1998年第2期

论文作者：Zhou Kechao Huang Baiyun Qu Xuanhui Cheng Xiaoqun Zhang Zhongyuan Zhou Jianhua

文章页码：269 - 272

Key words：superplastic deformation;　TiAl alloy;　dynamic recrystallization;　dislocation

Abstract: The tensile properties of thermomechanically processed Ti-33Al-3Cr-0.5Mo (mass fraction, %) alloy were determined at 1000℃. In an initial strain rate range of 2.0×10^-4~6.0×10^-4s^-1 superplastic deformation behaviour of fine grained specimens was observed, and the relative elongations ranging from 200%~305% were obtained. After deformation grain size became finer, a lot of dislocations were found. Combined with TEM observations, it was suggested that superplastic deformation was controlled by grain boundary sliding accomodated by movement of dislocation and dynamic recrystallization.