中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 8 No. 1 March 1998 |
(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