Dry sliding wear behavior of copper with nano-scaled twins
Dry sliding wear behavior of copper with nano-scaled twins
复制标题
纳米孪晶铜的干滑动磨损行为
作者：
A 99.99wt.%采用表面机械研磨处理（SMAT）方法制备了表面含有高密度纳米孪晶的铜板。研究了纳米孪晶Cu与等轴晶Cu和粗晶Cu的摩擦磨损性能。在所有的载荷和滑动速度下，相对于粗晶形式，纳米尺度的孪晶表面层的摩擦学性能显著增强，这被认为是源于孪晶界的强化。纳米孪晶和CG Cu的摩擦系数和磨损率随滑动速度的增加而缓慢增加，在0.08m/s时略有下降。当速度超过0.08m/s时，所有试样的摩擦系数和磨损率都急剧增加，这与混合表层的磨损相对应。
A 99.99wt.% copper plate with a surface layer containing a high density of nano-scaled twins has been synthesized by means of surface mechanical attrition treatment (SMAT). The friction and wear characteristics of the nano-twinned Cu sample were investigated in comparison with those of equiaxed nanocrystalline Cu and coarse-grained (CG) Cu samples. The tribological properties are markedly enhanced with nano-scaled twin surface layer relative to the coarse-grained form at all the loads and the sliding speeds, which is supposed to originate from the strengthening of twin boundaries. The friction coefficients and wear rates of the nano-twinned and the CG Cu increase slowly with an increasing sliding speed, and slightly decrease at a speed of 0.08m/s. When the speed exceeds 0.08m/s, there occurs a steep increase of the friction coefficients and wear rates for all the samples, corresponding to the wearing away of the mixed surface layer.
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