Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals
Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals
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面心立方金属中非螺旋晶格位错与相格孪晶边界之间的相互作用
DOI：
10.1016/j.actamat.2007.11.020
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发表时间：
2008-03-01
期刊：
影响因子：
9.4
通讯作者：
Hahn, H.
中科院分区：
文献类型：
--
作者：
Jin, Z. -H.;Gumbsch, P.;Hahn, H.
在第一份报告中[Jin ZH.. Gumbsch P，Ma E，Albe K，Lu K，Hahn H，et al. Scripta Mater 2006;54：1163]，通过分子动力学模拟研究了三种面心立方（fcc）金属Cu，Ni和Al的螺位错和共格孪晶界（CTB）之间的相互作用。为了补充这些初步结果，本文考虑了60度非螺晶格位错和CTB之间的纯应力驱动的相互作用。根据材料和施加的应变，已经观察到滑移以不同的方式与边界相互作用。如果一个60度位错被一个外部应力强制进入一个CTB，它会分解成不同的部分位错，这些部分位错既可以滑入孪晶，也可以沿着孪晶界。如果过渡滑移不完全，则可在CTB处产生固着位错锁。的相互作用的细节是由材料相关的能量势垒的形成肖克莱部分位错的晶格位错撞击在边界上的网站控制。(c)2007 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
In a first report [Jin ZH.. Gumbsch P, Ma E, Albe K, Lu K, Hahn H, et al. Scripta Mater 2006;54:1163], interactions between screw dislocation and coherent twin boundary (CTB) were studied via molecular dynamics simulations for three face-centered cubic (fcc) metals, Cu, Ni and Al. To complement those preliminary results, purely stress-driven interactions between 60 degrees non-screw lattice dislocation and CTB are considered in this paper. Depending on the material and the applied strain, slip has been observed to interact with the boundary in different ways. If a 60 degrees dislocation is forced by an external stress into a CTB, it dissociates into different partial dislocations gliding into the twin as well as along the twin boundary. A sessile dislocation lock may be generated at the CTB if the transited slip is incomplete. The details of the interaction are controlled by the material-dependent energy barriers for the formation of Shockley partial dislocations from the site where the lattice dislocation impinges upon the boundary. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.