Shear stress-driven refreshing capability of plastic deformation in nanolayered metals.
Shear stress-driven refreshing capability of plastic deformation in nanolayered metals.
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DOI：
10.1103/physrevlett.110.155502
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发表时间：
2013-04
影响因子：
8.6
通讯作者：
J. Yan;X. Zhu;B. Yang;G. P. Zhang
中科院分区：
文献类型：
--
作者：
J. Yan;X. Zhu;B. Yang;G. P. Zhang
剪切带内的严重局部变形可以更容易地发生在具有纳米级微结构的金属中，例如纳米晶粒和纳米层材料。基于原子尺度的观察，在这里，我们表明，这种局部大变形（层的连续变薄）内的压痕引起的剪切带的Cu/Au纳米层基本上是由于大的剪切应力分量沿着的界面，这可以刷新的接口，通过解锁的位错界面反应的产物吸收传入的位错的能力。研究结果对于理解界面介导的塑性变形机制和纳米尺度下金属剧烈塑性变形加工的工程应用具有重要意义。
Severely localized deformation within shear bands can occur much more easily in a metal with nanoscale microstructures, such as nanograined and nanolayered materials. Based on atomic-scale observations, here we show that such locally large deformation (the continuous thinning of the layers) within the indentation-induced shear bands of the Cu/Au nanolayers is essentially attributed to the large shear stress component along the interface, which can refresh the capability of the interface to absorb incoming dislocations through unlocking the product of the dislocation-interface reaction. The results have implications for understanding the interface-mediated mechanisms of plastic deformation and for the engineering application of severe plastic deformation processing of metals at nanoscales.