Dislocation reactions, Plastic anisotropy and forest strengthening in MgO at high temperature
Dislocation reactions, Plastic anisotropy and forest strengthening in MgO at high temperature
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DOI：
10.1016/j.mechmat.2014.01.001
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发表时间：
2014-04-01
影响因子：
3.9
通讯作者：
Cordier, P.
中科院分区：
文献类型：
--
作者：
Amodeo, J.;Devincre, B.;Cordier, P.
用三维位错动力学模拟方法研究了高温区和恒应变率下氧化镁中位错的集体性质。滑移系统1/2<；1 1 0>；{1 1 0}和1/2<；1 1 0>；{1 1 0}之间的交点基本上允许两种类型的连接反应。这些交汇点在能量上是稳定的，并有望在高温下促进强大的森林强化。大规模的DD模拟表明，高温下的MgO应变硬化可能受森林反应的影响。最后计算了基于位错密度的氧化镁塑性模拟的重要参数，并与实验结果进行了验证。(C)2014爱思唯尔有限公司。保留所有权利。
The collective properties of dislocations in MgO are investigated in the high temperature regime and at constant strain rate with 3D Dislocation Dynamics simulations. Intersections between slip systems 1/2 < 1 1 0 >{1 1 0} and 1/2 < 1 1 0 >{1 1 0} allow essentially two types of junction reactions. These junctions are energetically stable and are expected to promote strong forest strengthening at high temperature. Large-scale DD simulations show that MgO strain hardening at high temperature may be dominated by forest reactions. Important parameters for dislocation density based modeling of MgO plasticity are finally calculated and verified to be consistent with experimental observations. (C) 2014 Elsevier Ltd. All rights reserved.