Dynamic recovery and its orientation dependence in face-centered cubic crystals
Dynamic recovery and its orientation dependence in face-centered cubic crystals
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DOI：
10.1016/j.actamat.2009.02.013
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发表时间：
2009-05-01
期刊：
影响因子：
9.4
通讯作者：
Devincre, B.
中科院分区：
文献类型：
--
作者：
Kubin, L.;Hoc, T.;Devincre, B.
本文研究了面心立方晶体中动态回复与螺型位错临界湮灭距离的取向关系。状态III的发病的临界条件进行了讨论，在一个交叉滑移机制，这是局部修改与相邻的吸引力螺位错的相互作用。定义了两个方向域。从[111]到标准赤平投影三角形的中心区域，相互吸引的应力强制产生钝的交叉滑移，这抑制了动态恢复。动态恢复的临界参数，然后使用简单的标度律推导。对于其他方向，相互作用应力增强的交叉滑移，这是使用Escaig的模型处理。数值结果得到使用一个单一的可调参数。它们与300 K时铜和银的实验数据完全一致。讨论强调需要更精确的信息，从原子尺度的动态恢复过程建模。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The orientation dependence of dynamic recovery in face-centered cubic crystals is investigated in relation to the critical annihilation distance of screw dislocations. The critical conditions for the onset of state III are discussed in terms of a cross-slip mechanism that is locally modified by the interaction with a neighboring attractive screw dislocation. Two orientation domains are defined. From [111] to the central region of the standard stereographic triangle, the attractive interaction stress enforces obtuse cross-slip, which inhibits dynamic recovery. The critical parameters for dynamic recovery are then derived using simple scaling laws. For other orientations, the interaction stress enhances cross-slip, which is treated using Escaig's model. Numerical results are obtained using a single adjustable parameter. They are fully consistent with experimental data in copper and silver at 300 K. The discussion emphasizes the need for more precise information from atomic-scale modeling of the dynamic recovery process. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.