期刊
WEAR
卷 262, 期 11-12, 页码 1463-1470出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2007.01.012
关键词
copper; nano-scaled twin; sliding; unlubricated wear; surface mechanical attrition treatment (SMAT)
A 99.99 wt.% 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 0.08 m/s. When the speed exceeds 0.08 m/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. (C) 2007 Elsevier B.V. All rights reserved.
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