Dislocation cross-slip mechanisms in aluminum

Dislocation cross-slip mechanisms in aluminum
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铝中的位错交叉滑移机制

DOI:
10.1080/14786435.2011.602030
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发表时间:
2011-10
影响因子:
1.6
通讯作者:
Lu, Gang
Lu, Gang
中科院分区:
材料科学3区
文献类型:
--
作者:
Jin, Congming;Xiang, Yang;Lu, Gang

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我们系统地研究了位错在零温度下的交叉滑移在Al原子模拟,重点是依赖于位错的长度和位置的过渡路径和能量障碍。我们发现,对于一个短的位错段,交叉滑移遵循均匀弗莱舍(FL)机制。对于一个较长的位错段,我们已经确定了两种不同的交叉滑移机制,这取决于初始和最终位置的位错。如果初始位置和最终位置相对于主滑移面和交叉滑移面的交点对称,则位错通过Friedel-Escaig(FE)机制交叉滑移。然而,当初始位置和最终位置不对称时,位错通过FL和FE机制的组合交叉滑移。先导部分首先向交叉滑移面折叠,在交叉点处形成阶梯-杆位错,随后通过FL机制与先导部分合并。之后,收缩出现不对称,并相互远离,通过FE机制完成交叉滑动。
We have systematically studied dislocation cross-slip in Al at zero temperature by atomistic simulations, focusing on the dependence of the transition paths and energy barriers on dislocation length and position. We find that for a short dislocation segment, the cross-slip follows the uniform Fleischer (FL) mechanism. For a longer dislocation segment, we have identified two different cross-slip mechanisms depending on the initial and final positions of the dislocation. If the initial and final positions are symmetric relative to the intersection of the primary and cross-slip planes, the dislocation cross-slips via the Friedel–Escaig (FE) mechanism. However, when the initial and final positions are asymmetric, the dislocation cross-slips via a combination of the FL and FE mechanisms. The leading partial folds over to the cross-slip plane first, forming a stair-rod dislocation at the intersection with which the trailing partial then merges via the FL mechanism. Afterwards, constrictions appear asymmetrically and move away from each other to complete the cross-slip via the FE mechanism.
DOI: 10.1002/pssb.19650090123
发表时间: 1965-12
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