The effects of load condition on void coalescence in FCC single crystals
The effects of load condition on void coalescence in FCC single crystals
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载荷条件对 FCC 单晶孔隙聚结的影响
DOI：
10.1016/j.commatsci.2012.02.036
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发表时间：
2012-07
影响因子：
3.3
通讯作者：
刘文辉
中科院分区：
文献类型：
--
作者：
刘文辉
为研究载荷条件对面心立方晶体中孔洞合并的影响，采用三维晶体塑性有限元方法，以率相关晶体塑性理论为用户材料子程序，研究了恒应变控制下的孔洞合并。通过对单晶中空穴间韧带宽度的比较，揭示了载荷条件对空穴合并的显著影响：（1）晶体取向对空穴合并起作用，且在不同载荷条件下作用不同。(2)在三轴应变加载条件下，变形集中在孔洞周围，且软取向的滑移系容易被激活，因此软取向的孔洞比硬取向的孔洞更容易合并，且孔洞生长方向对不同晶向的合并效果影响较小。(3)在低双轴应变加载条件下，变形局部化不严重，软取向的整体变形均匀，软取向的聚并效应一般较小。
To investigate the effects of load condition on void coalescence in FCC crystals, void coalescence under constant strain control was studied by using three-dimensional crystal plasticity finite element method, which was implemented with rate dependent crystal plasticity theory as user material subroutine. By comparison the width of inter-void ligament in single crystals, significant effects of load condition on void coalescence were revealed: (1) Crystallographic orientation plays a role in void coalescence, and the role is different under various load conditions. (2) The deformation is localized around voids under triaxial applied strain load condition, and the slip systems in soft orientation are easy to be activated, so voids in soft orientation grains tend to coalesce much easier than that in hard orientation, and the void growth direction has only a minor role in influencing the coalescence effect for different crystallographic orientations. (3) Under low biaxial applied strain load condition, the deformation localization is not serious, and the global deformation of soft orientation is homogeneous, so soft orientation shows less coalescence effect in general.
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