【作者】 张于胜； 王科； 韩忠；

【Author】 Zhang Yu-sheng Wang Ke Han Zhong (Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,72 Wenhua Road,Shenyang 110016,P.R.China)

【机构】 中国科学院金属研究所沈阳材料科学国家(联合)实验室；

【摘要】 采用表面机械研磨(SMAT)方法,通过不同工艺,成功地在纯铜表面分别制备出25μm 等轴纳米晶层和10μm 纳米孪晶层。对纳米晶,纳米孪晶及普通粗晶铜进行滑动磨损实验。结果表明,在不同滑动速度下,纳米晶和纳米孪晶铜耐磨性均明显优于普通粗晶铜。当滑动速度小于0．08m/s 时,三种铜样品摩擦系数和磨损率随着速度增加变化不大。当速度超过0．08m/s 时, 由于表面机械混合层消失以及材料软化,三种铜样品摩擦系数和磨损率急剧增加。更多还原

【Abstract】 A pure copper plate with a 25 μm depth equiaxed nanocrystalline surface layer or a 10 μm depth nano-scaled twin lamella surface layer has been synthesized by means of surface mechanical attrition treatment(SMAT).The sliding wear characteristics of the nanocrystalline,nano-twinned Cu,coarse-grained sample were investigated.The results show that the tribological properties are markedly enhanced with nanocrystalline and nano-scaled twin surface layer relative to the coarse-grained form at all the sliding speeds.Under sliding speed lower than 0.08 m/s,the friction coefficients and wear rates of all the samples change slightly.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 and softening of the matrix.更多还原