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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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VISCOUS AND RHEOLOGIC SUPERPLASTIC TECHNIQUE
He Yuehui, Huang Baiyun and Liu Yong

Powder Metallurgy Research Institute,Central South University of Technology, Changsha 410083, P. R. China

Abstract:A new viscous-rheologic superplastic technique for TiAl based alloy has been explored successfully, which can be divided into three stages: accelerated deformation at large load, viscous-rheologic deformation at low load and final deformation at increasing load. In above three stages, three respective deformation mechanisms exist: coerced grain boundary movement, grain boundary viscous-rheologic sliding, grain boundary sliding aided by sliding inside grains. The damage of recrystallization and neck shrinkage on superplasticity can be avoided in this technique.

 

Key words: TiAl based alloy superplasticity deformation mechanism

ISSN 1672-7029
CN 43-1423/U

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