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首页> 外文期刊>Intermetallics >Tribological behaviors of Zr-based bulk metallic glass versus Zr-based bulk metallic glass under relative heavy loads
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Tribological behaviors of Zr-based bulk metallic glass versus Zr-based bulk metallic glass under relative heavy loads

机译：相对重载下Zr基大块金属玻璃与Zr基大块金属玻璃的摩擦学行为

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As a novel engineering material, bulk metallic glass (BMG) has received much attention. However, the knowledge concerning the tribological behavior of BMG versus BMG under relatively heavy loads is still insufficient. In this study, Zn41Ti14Cu125Ni10Be22.5 metallic glass pins and discs were prepared by copper-mold suction casting. The dry sliding friction and the wear characteristics of the as-cast Zr-based BMG versus Zr-based BMG were tested under loads of 100, 125 and 150 N, respectively, using a pin-on-disc tribological apparatus at room temperature. The worn surfaces were studied by scanning electron microscopy in order to identify the wear mechanisms. The results showed that both the coefficient of friction and the wear rate increased with both the normal load and the rotational sliding velocity. X-ray diffraction patterns recorded after the tribological experiments indicated that no sliding-induced crystallization occurred. Transmission electron microscopy was also used to confirm the amorphous of the BMGs after sliding tests. In addition, the wear mechanisms changed with the experimental conditions. For a normal load of 100 N, the main mechanisms were abrasive wear, slight grooves and micro-cracks. For higher loads, adhesive wear was predominant, accompanied by abrasive wear and deeper grooves and more micro-cracks. When the rotational sliding velocity was increased, the dominant wear changed from slight grooves to viscous flow and adhesive wear. (C) 2015 Elsevier Ltd. All rights reserved.
机译：作为一种新型工程材料，块状金属玻璃（BMG）受到了广泛关注。但是，有关BMG与BMG在相对重负载下的摩擦学行为的知识仍然不足。在这项研究中，Zn41Ti14Cu125Ni10Be22.5金属玻璃销和圆盘通过铜模吸铸法制备。在室温下，使用销盘式摩擦学设备分别在100 N，125 N和150 N的负载下测试了铸态Zr基BMG与Zr基BMG的干滑动摩擦和磨损特性。通过扫描电子显微镜研究磨损的表面，以识别磨损机理。结果表明，摩擦系数和磨损率都随着法向载荷和旋转滑动速度的增加而增加。摩擦学实验后记录的X射线衍射图谱表明未发生滑动诱导的结晶。滑动测试后，透射电子显微镜还用于确认BMG的非晶态。另外，磨损机理随实验条件而改变。对于100 N的正常负载，主要机理是磨料磨损，轻微的沟槽和微裂纹。对于更高的负载，主要是粘合剂磨损，伴随着磨料磨损，更深的凹槽和更多的微裂纹。当旋转滑动速度增加时，主要磨损从微小的沟槽变为粘性流和粘着剂磨损。 （C）2015 Elsevier Ltd.保留所有权利。

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