Assessment of strain hardening in copper single crystals using in situ SEM microshear experiments
Assessment of strain hardening in copper single crystals using in situ SEM microshear experiments
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使用原位 SEM 微剪切实验评估铜单晶的应变硬化
DOI：
10.1016/j.actamat.2016.04.055
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发表时间：
2016
期刊：
影响因子：
9.4
通讯作者：
G. Eggeler
中科院分区：
文献类型：
--
作者：
N. Wieczorek;G. Laplanche;J.-K. Heyer;A.B. Parsa;J. Pfetzing-Micklich;G. Eggeler
利用扫描电子显微镜（SEM）研究了预应变对原位微剪切变形铜单晶塑性的影响。使用[1 0 0]拉伸测试施加6.5和20%的预应变。在拉伸预变形过程中，多个滑移系被激活，形成不规则分布的滑移带。痕量分析揭示了在夹具附近的拉伸试样上存在几个滑移带，而在拉伸试样的中间检测到一个平行于（111）晶面的滑移带族。从预变形拉伸试样的中间，使用聚焦离子束（FIB）加工制备双微剪切试样，使得[0 - 1 - 1]（1 - 11）滑移系统可以被直接激活。结果表明，微剪切行为的反应，不同程度的拉伸预变形。在微剪切试验过程中观察到突然变形事件（SDES）。的临界应力与第一个的预变形的结果，作为一个增加的数量的滑移带在预变形过程中引入每个剪切区的增加而增加。结果还允许获得关于在微剪切期间激活的位错（[0 - 1 - 1]（1 - 11））与在拉伸预变形期间引入的位错（[1 0 - 1]（1 1 1）和[1 - 1 0]（1 1 1））之间的相互作用的信息。当这些滑动系统相互作用时，可能形成滑动连接和Lomer-Cottrell锁。根据这一分析，我们合理化的突然变形事件的发生的基础上堆积的位错组件，克服了洛默-科特雷尔锁障碍。
The effect of a pre-strain on the plasticity of copper single crystals subjected to in situ microshear deformation in a scanning electron microscope (SEM) is investigated. Pre-strains of 6.5 and 20% are imposed using [1 0 0] tensile testing. During tensile pre-deformation, several slip systems are activated and irregularly spaced slip bands form. A trace analysis revealed the presence of several slip bands on the tensile specimen near the grips while one family of slip bands parallel to the (1 1 1) crystallographic plane were detected in the middle of the tensile specimen. From the middle of the pre-deformed tensile specimens double microshear samples were prepared using focused ion beam (FIB) machining such that the [0 -1 -1] (1 -1 1) slip system could be directly activated. The results show how microshear behavior reacts to different levels of tensile pre-deformation. Sudden deformation events (SDEs) are observed during microshear testing. The critical stress associated with the first SDE is shown to increase with increasing pre-deformation as a result of an increasing number of slip bands introduced during pre-deformation per shear zone. The results allow also to obtain information on the interaction between dislocations activated during microshearing ([0 -1 -1] (1 -1 1)) and those which were introduced during tensile pre-deformation ([1 0 -1] (1 1 1) and [1 -1 0] (1 1 1)). When these slip systems interact glissile junctions and Lomer-Cottrell locks are likely to form. In the light of this analysis, we rationalize the occurrence of sudden deformation events based on piled up dislocation assemblies which overcome Lomer-Cottrell lock barriers.
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影响因子：
5.3
作者：
Dequiedt, J. L.;Denoual, C.;Madec, R.
通讯作者：
Madec, R.
DOI：
--
发表时间：
1977
期刊：
影响因子：
--
作者：
U. Alpen;J. Doukhan
通讯作者：
J. Doukhan
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
H. Alexander;J. L. Crawford
通讯作者：
J. L. Crawford
微米级的预期和意外塑性行为：原位 μLaue 拉伸研究
影响因子：
9.4
作者：
C. Kirchlechner;P. Imrich;W. Grosinger;M. Kapp;J. Keckes;J. Micha;O. Ulrich;O. Thomas;S. Labat;C. Motz;G. Dehm
通讯作者：
G. Dehm
影响因子：
0.8
作者：
Kiener, Daniel;Motz, Christian;Pippan, Reinhard
通讯作者：
Pippan, Reinhard