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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 2    June 1998

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SUPERPLASTIC DEFORMATION OF TiAl BASED ALLOY
Zhou Kechao1  Huang Baiyun1  Qu Xuanhui1 and Cheng Xiaoqun1 Zhang Zhongyuan2 and Zhou Jianhua2

1.National Key Laboratory For Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China;
2.University of Aeronautics and Astronautics Nanjing, Nanjing210016, P. R. China

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.

 

Key words: superplastic deformation TiAl alloy dynamic recrystallization dislocation

ISSN 1672-7029
CN 43-1423/U

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