Effect of Surface Mechanical Attrition Treatment on Tribological Behavior of the AZ31 Alloy

Shuangwu Xia¹，Yong Liu¹，Dongming Fu¹，Bin Jin¹，Jian Lu^2,3

1. Key Laboratory of Near Net Forming of Jiangxi Province,Nanchang University2. Department of Mechanical and Biomedical Engineering,City University of Hong Kong3. Centre for Advanced Structural Materials,Shenzhen Research Institute,City University of Hong Kong

摘 要：By surface mechanical attrition treatment（SMAT）,a gradient nano structure（GNS） from the surface to center was generated in the AZ31 alloy sheet.The tribological behavior of AZ31 alloy with GNS was systematically investigated by using dry sliding tests,a 3D surface profile-meter and a scanning electron microscope equipped with an energy-dispersive spectrometer.The experimental results indicate that the Mg alloy with GNS exhibits better wear resistance comparing to the as-received sample,which is associated to the alteration of wear mechanism at different sliding speeds.The Mg alloy with GNS presents the wear mechanism of the abrasive wear at 0.05 m/s and the oxidative wear at 0.5 m/s,respectively.Moreover,the GNS can effectively promote the reaction between the oxygen and worn surface,which leads to a compact oxidation layer at 0.5 m/s.The effect of oxidation layer on the wear resistance of the Mg alloy was also discussed.

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