VISCOUS AND RHEOLOGIC SUPERPLASTIC TECHNIQUE

来源期刊：中国有色金属学报(英文版)1998年第1期

论文作者：He Yuehui Huang Baiyun Liu Yong

文章页码：48 - 51

Key words：TiAl based alloy;　superplasticity;　deformation;　mechanism

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.