Friction and wear behaviors of nanocrystalline surface layer of pure copper
Friction and wear behaviors of nanocrystalline surface layer of pure copper
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DOI：
10.1016/j.wear.2005.06.010
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发表时间：
2006-05
期刊：
影响因子：
5
通讯作者：
Yusheng Zhang;Z. Han;Ke Wang;K. Lu
中科院分区：
文献类型：
--
作者：
Yusheng Zhang;Z. Han;Ke Wang;K. Lu
采用表面机械摩擦处理（SMAT）在纯铜板上制备纳米晶表面层。晶粒尺寸在顶层约为10nm，并且随着距处理表面深度的增加而增大。研究了纳米晶表面层在干燥条件下的摩擦学行为。实验结果表明，纳米晶表面层相对于粗晶表面层的承载能力明显增强。当外加载荷低于20N时，纳米晶层的摩擦系数低于粗晶铜层的摩擦系数。随着载荷的增大，SMAT与常规Cu的耐磨性差异减小。当载荷超过40N时，SMAT Cu发生了从局部损伤到机械混合层脱层的磨损转变。磨损体积急剧增大，这与纳米晶层的磨损相对应。纳米晶表面层磨损性能的增强与机械混合层的稳定性和纳米晶结构的高硬度有关。
Surface mechanical attrition treatment (SMAT) was employed to fabricate a nanocrystalline surface layer on a pure copper plate. The grain size is about 10nm in the top layer and increases with an increasing depth from the treated surface. The tribological behavior of the nanocrystalline surface layer was investigated under dry conditions. Experimental results show that the load-bearing ability is markedly enhanced with the nanocrystalline surface layer relative to the coarse-grained form. The friction coefficient of the nanocrystalline layer is lower than that of the coarse-grained copper when the applied load is below 20N. With increase of the load, the difference in wear resistance between the SMAT and the conventional Cu decreases. When the load exceeds 40N, for the SMAT Cu, there occurs a transition of wear regime from local damage to delamination of a mechanical mixed layer. There is an abrupt increase of the wear volume, which corresponds to the wearing away of the nanocrystalline layer. The enhanced wear properties of the nanocrystalline surface layer are correlated with the stability of the mechanical mixed layer and the high hardness of the nanocrystalline structure.