The origin of surface microstructure evolution in sliding friction
The origin of surface microstructure evolution in sliding friction
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DOI：
10.1016/j.scriptamat.2018.04.048
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发表时间：
2018-08-01
影响因子：
6
通讯作者：
Gumbsch, Peter
中科院分区：
文献类型：
--
作者：
Greiner, Christian;Liu, Zhilong;Gumbsch, Peter
典型的摩擦学诱导显微组织表现出平行于表面的不连续，将近表面层与块体分开。尽管它无处不在的观察，但表面下的这一层的起源仍然难以捉摸。在这里，我们发现在第一次加载后，已经在100-150 nm深度处发现了局域位错结构。这种结构与移动压头下的非均匀应力场有关，当应力低于材料的屈服应力时，位错被捕获。因此，可以利用初始摩擦学载荷的控制来设计具有优异摩擦学性能的表面和材料。(C)2018 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
A typical tribologically induced microstructure displays a discontinuity parallel to the surface separating the near surface layer from the bulk. Despite its ubiquitous observation, the origin of this layer underneath the surface remains elusive. Here, we show that already after the first loading pass a localized dislocation structure is found at a depth of 100-150 nm. This structure is linked to the inhomogeneous stress field under the moving indenter, where dislocations are trapped when the stress drops below the material's yield stress. Control of the initial tribological loading could therefore be exploited to design surfaces and materials with superior tribological properties. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.