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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 2    June 1999

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SUPERPLASTIC BEHAVIOR OF HOT-FORGED TiAl-BASED ALLOY
Deng Zhongyong, Huang Baiyun , He Yuehui and Liu Yong

State Key Laboratoryfor Powder Metallurgy,Central South University of Technology, Changsha 410083, P. R. China

Abstract:Aγ-TiAl based material with a composition of Ti-33Al-3Cr-0.5Mo(mass fraction, %) was hot forged to produce fine-grained microstructure with good homogeneity. Samples of the hot-forged material were tested at strain rates ranging from 8×10-5s-1to 8×10-4s-1and temperatures between 1 000℃and 1 075℃to investigate its superplastic behavior. Results showed the occurrence of strain hardening and highm values which led to the good superplasticity of this alloy. Optimum superplastic forming conditions were at 1 075℃and a strain rate of 8×10-5s-1. Under these conditions, the maximum elongation to fracture of  517% was achieved.

 

Key words: TiAl deformation superplasticity strain rate

ISSN 1672-7029
CN 43-1423/U

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