The effects of crack orientation on the twin formation from the crack tip in γ′-Ni3Al
The effects of crack orientation on the twin formation from the crack tip in γ′-Ni3Al
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DOI：
10.1016/j.msea.2013.05.048
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发表时间：
2013-09
期刊：
影响因子：
6.4
通讯作者：
Hongxian Xie;Tao Yu;F. Yin;Chengchun Tang
中科院分区：
文献类型：
--
作者：
Hongxian Xie;Tao Yu;F. Yin;Chengchun Tang
通过制备三种Ⅰ型裂纹，研究了γ′-Ni 3Al中裂纹取向对裂纹尖端孪晶形成的影响。模拟结果表明，（001）<110>型裂纹在裂纹尖端产生两个滑动带;而（1 ￣ 10）<110>和（11 ￣ 1 ￣）<110>型裂纹在裂纹尖端产生孪晶而不是滑动带。孪晶的形成机制是1/6[112]型Shockley位错在连续{111}面上的滑移。从广义层错能和剪切应力两个方面研究了孪晶和滑移带形成的原因，结果表明，孪晶和滑移带形成的主要原因是（111）滑移系剪切应力的不对称性<112>。
The effect of crack's orientation on the twin formation from the crack tip inγ′-Ni3Al has been studied by fabricating three types of mode I crack. The simulation results show that (001)<110> type crack produces two slip bands at the crack tip; however, (1̄10)<110> and (11̄1̄)<110> type cracks produce twins rather than slip bands at the crack tip. The formation mechanism of the twin is the slipping of 1/6[112] type Shockley partial dislocations on consecutive {111} planes. The underlying reasons of the twin and slip band formation have been studied in term of the generalized stacking fault energy and shear stress, and the study results show that it can be attributed to the asymmetry of shear stress associated with (111)<112> slip system.