(中南大學 材料科學與工程學院，長沙 410083)
摘 要: 通過編制率相關(guān)有限元用戶子程序，采用包含一個和兩個球形孔洞的單胞探求了FCC晶體中晶體取向?qū)锥撮L大和聚合的影響。計算結(jié)果表明：晶體取向?qū)锥撮L大的影響較大，孔洞的形狀和長大方向與晶體取向密切相關(guān)；由于變形不均勻，孔洞在晶界處產(chǎn)生尖角，易形成裂紋。由于約束較少，孔洞周圍和兩孔洞間的區(qū)域塑性變形較大，晶體的轉(zhuǎn)動和滑移主要集中在孔洞周圍以及兩孔洞間的區(qū)域。
關(guān)鍵字: 晶體取向；孔洞；晶體塑性；有限元；聚合
void growth and coalescence
（School of Materials Science and Engineering, Central South University,
Changsha 410083, China）
Abstract: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 corners 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.
Key words: crystallographic orientation; void; crystal plasticity; FEM; coalescence
