Dislocation slip transmission through a coherent Σ3{111} copper twin boundary: Strain rate sensitivity, activation volume and strength distribution function
Dislocation slip transmission through a coherent Σ3{111} copper twin boundary: Strain rate sensitivity, activation volume and strength distribution function
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DOI：
10.1016/j.actamat.2018.09.045
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发表时间：
2018-12
期刊：
影响因子：
9.4
通讯作者：
N. Malyar;B. Grabowski;G. Dehm;C. Kirchlechner
中科院分区：
文献类型：
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作者：
N. Malyar;B. Grabowski;G. Dehm;C. Kirchlechner
我们提出了通过相干Σ3{111}铜孪晶界的理想位错滑移传递的应变率灵敏度的第一次测量。为此，我们在不同的应变速率下变形了129个几何形状相同的样品。微米尺寸的样品要么是单晶（87个柱），要么包含一个垂直的Σ3{111}孪晶界（42个柱）。理想滑移传递事件的应变率灵敏度为0.015 ± 0.009。该值明显低于观察到的纳米孪晶块状材料的应变率灵敏度，后者针对的是在后一种情况下存在的多个同时激活的变形过程。理想滑移传输的激活体积指向位错通过孪晶界的交叉滑移传输过程。此外，大量几何相同的样品被用来讨论识别微柱的强度分布函数的能力。
We present the first measurement of the strain rate sensitivity of the ideal dislocation slip transmission through a coherent Σ3{111} copper twin boundary. For this purpose we have deformed 129 geometrically identical samples at different strain rates. The micron-sized samples are either single crystalline (87 pillars) or contain one vertical Σ3{111} twin boundary (42 pillars). The strain rate sensitivity of the ideal slip transmission event is 0.015 ± 0.009. This value is considerably lower than the strain rate sensitivity observed for nano-twinned bulk materials, which is addressed to multiple simultaneously activated deformation processes present in the latter case. The activation volume of the ideal slip transmission points towards a cross-slip like transmission process of dislocations through the twin boundary. Furthermore, the high number of geometrically identical samples is used to discuss the ability to identify the strength distribution function of micropillars.