W Liang~1
,
2)
,
Q. Li~2) and D.ZYang~2)(Centre of Measuring and Testing Taiyuan University of Technology
,
Taiyuan 030024
,
China Institute of Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001 China Manuscript received 13 November 1995)
金属学报(英文版)
An in situ study of twinning at crack tip in a TiAl-base alloy has been performed.The result shows that twinning with long shear vector(2/6) [112] can generate on(111) plane, even though usually it is very difficult to occur because of the high energy barrier. It was further shown that (1/6) [112](111) twinning is considerably easier to generate. Furthermore,(1/2)<110) ordinary dislocations were very active and dominated nearly the whole plastic zone, in spite of low Schmid factors. On the other hand, however <101) and (1/2) <112] superdislocations with higher Schmid factors can hardly be observed.
关键词:
:TiAl-base alloy
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