FCC晶体中晶体取向对孔洞长大和聚合的影响

通过编制率相关有限元用户子程序，采用包含一个和两个球形孔洞的单胞探求了FCC晶体中晶体取向对孔洞长大和聚合的影响。计算结果表明：晶体取向对孔洞长大的影响较大，孔洞的形状和长大方向与晶体取向密切相关：由于变形不均匀，孔洞在晶界处产生尖角，易形成裂纹。由于约束较少，孔洞周围和两孔洞间的区域塑性变形较大，晶体的转动和滑移主要集中在孔洞周围以及两孔洞间的区域。

Effects of crystallographic orientation on void growth and coalescence

The influence of crystallographic orientation on void growth and coalescence in FCC single crystal was simulated with 3D crystal plasticity finite element, and the rate-dependent crystal plasticity theory was implemented as a user material subroutine. A 3D unit cell including one sphere void and two sphere voids was employed with three-dimensional 12 slip systems. The computed results of different crystallographic orientations were compared, The results show that the crystallographic orientation has significant influence on the growth behavior of void, and the void growth direction and shape significantly depend on the crystallographic orientation. Due to inhomogeneous deformation, some comers where crack will initiate can be induced at grain boundaries. The rotation of the crystalline lattice and plastic activity on slip systems are mainly concentrated in the region around voids.