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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 1    March 1998

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SUPERPLASTIC BEHAVIOUR OF A FINE GRAINED TiAl BASED ALLOY TREATED
BY MULTI-STEP THERMO-MECHANICAL TREATMENT
Huang Baiyun1 Deng Zhongyong1 and He Yuehui1  Sun Jian2 and Liu Qin2

1.Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, P. R. China;
Department of Materials Science and Engineering ShanghaiJiao Tong University, Shanghai200030, P. R. China

Abstract:A Ti-33Al-3Cr (mass fraction, %) alloy was multi-step thermo-mechanically treated through hot can forging. Samples of the forged plate were tension tested at strain rates of 10-5 to 10-3s-1 and temperatures between 1 000℃and 1075℃. At 1075℃and a strain rate of 8×10-5s-1, the maximum elongation(517%) was achieved. The strain rate sensitivity coefficientmwas about 0.7 under the conditions of 1 075℃and 6×10-5s-1.

 

Key words: TiAl forging superplasticity

ISSN 1672-7029
CN 43-1423/U

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