FEM simulation of void coalescence in FCC crystals
FEM simulation of void coalescence in FCC crystals
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DOI：
10.1016/j.commatsci.2010.08.033
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发表时间：
2010-12
影响因子：
3.3
通讯作者：
Wen-hui Liu;Hao Huang;Jianguo Tang
中科院分区：
文献类型：
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作者：
Wen-hui Liu;Hao Huang;Jianguo Tang
为了研究面心立方晶体中空洞的合并行为，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，采用3种双晶体模型研究了单晶空洞、晶界空洞和双晶空洞的合并行为.通过比较双晶中空穴间韧带的宽度，揭示了取向因子和大角度晶界对空穴聚并的显著影响：（1）在应变控制的边界条件下，软取向晶粒中的空穴比硬取向晶粒中的空穴更容易聚并。(2)对于空洞在晶界处的聚并，随着晶粒间取向因子差的增大，晶粒间的变形失配增大，空洞更倾向于沿沿着晶界生长。(3)较大的取向因子差异促进了晶界处空洞的聚并，但减缓了晶间空洞的聚并。
To investigate the coalescence behaviors of voids in FCC crystals, three bicrystal models were used to study the coalescence of voids in single crystals, voids at grain boundary and voids in two grains 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 bicrystals, significant effects of orientation factor and high-angle grain boundary on void coalescence were revealed: (1) Voids in soft orientation grains tend to coalesce much easier than that in hard orientation under the strain controlled boundary condition. (2) For void coalescence at grain boundary, with the orientation factor’s difference between the two grains increasing, larger deformation mismatch is induced between grains, and the void prefers to grow along grain boundary. (3) Large orientation factor’s difference accelerate void coalescence at grain boundary, but decelerate void coalescence between grains.