Wear behavior of nanocrystalline structured magnesium alloy induced by surface mechanical attrition treatment
Wear behavior of nanocrystalline structured magnesium alloy induced by surface mechanical attrition treatment
复制标题
表面机械磨损处理纳米晶结构镁合金的磨损行为
DOI：
10.1016/j.surfcoat.2014.11.026
复制
发表时间：
2015-01-15
影响因子：
5.4
通讯作者：
Lu, Jian
中科院分区：
文献类型：
--
作者：
Liu, Yong;Jin, Bin;Lu, Jian
采用表面机械研磨处理（SMAT）方法制备了具有纳米晶表面层的Mg-6 Gd-3 Y-0. 5 Zr（GW 63 K）镁合金。采用干滑动磨损试验、三维光学轮廓仪、扫描电镜和能谱仪研究了纳米晶结构合金的磨损行为。与原始合金一起，比较微晶（MC）和纳米晶（NC）结构的镁合金的磨损行为。结果表明，SMAT诱导的NC结构层的耐磨性比MC合金差，这与不同滑动速度下的磨损机制不同有关。在0.05 m/s的磨粒磨损条件下，由于NC层的塑性和韧性较低，导致表面断裂，导致其耐磨性较差。在0.2m/s的高速下，磨损机制转变为氧化磨损，摩擦系数和磨损量降低。而NC合金层同时存在分层机制，大大降低了层的耐磨性。(C)© 2014 Elsevier B. V.保留所有权利。
An Mg-6Gd-3Y-0.5Zr (GW63K) magnesium (Mg) alloy with nanocrystalline surface layers was synthesized by using surface mechanical attrition treatment (SMAT). The wear behavior of the nanocrystalline structured alloy has been studied by dry sliding wear tests, 3D optical profiler, scanning electron microscope and energy-dispersive spectrometer. Together with the as-received alloy, a comparison between microcrystalline (MC) and nanocrystalline (NC) structured Mg alloys in wear behavior was performed. The result shows that the NC structured layer induced by SMAT exhibits worse wear resistance than MC alloy, which is related to the variation of wear mechanism under different sliding speeds. Under abrasive wear condition with sliding speed of 0.05 m/s, the poor wear resistance of NC layer is attributed to its low ductility and toughness, which leads to surface fracture. Under the high speed of 0.2 m/s, the wear mechanism transfers into oxidative wear leading to a low friction coefficient and wear mass loss. However, delamination mechanism performs simultaneously for the NC alloy, which greatly reduced wear resistance of the layer. (C) 2014 Elsevier B.V. All rights reserved.