Effect of Surface Mechanical Attrition Treatment on Tribological Behavior of the AZ31 Alloy
Effect of Surface Mechanical Attrition Treatment on Tribological Behavior of the AZ31 Alloy
复制标题
表面机械磨损处理对AZ31合金摩擦学行为的影响
DOI：
10.1016/j.jmst.2016.05.018
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发表时间：
2016
影响因子：
10.9
通讯作者：
Jian Lu
中科院分区：
文献类型：
--
作者：
Shuangwu Xia;Yong Liu;Dongming Fu;Bin Jin;Jian Lu
通过表面机械研磨处理（SMAT），在AZ 31镁合金板材中产生了从表面到中心的梯度纳米结构（GNS）。采用干摩擦磨损试验、三维表面形貌仪和扫描电子显微镜对GNS处理的AZ 31镁合金的摩擦学行为进行了系统的研究。实验结果表明，与原始试样相比，GNS处理后的镁合金具有更好的耐磨性，这与不同滑动速度下磨损机制的改变有关。在0.05 m/s时，GNS处理的镁合金表现为磨粒磨损机制;在0.5 m/s时，GNS处理的镁合金表现为氧化磨损机制。此外，GNS可以有效地促进氧气与磨损表面之间的反应，这导致在0.5 m/s下形成致密的氧化层。讨论了氧化层对镁合金耐磨性的影响。
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.