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AZ91镁合金及其Al2O3纤维-石墨颗粒混杂增强复合材料的滑动摩擦磨损性能研究
引用本文:杜军,李文芳,刘耀辉,苗耀新.AZ91镁合金及其Al2O3纤维-石墨颗粒混杂增强复合材料的滑动摩擦磨损性能研究[J].摩擦学学报,2004,24(4):341-345.
作者姓名:杜军  李文芳  刘耀辉  苗耀新
作者单位:1. 华南理工大学,机械工程学院,广东,广州,510641
2. 吉林大学,汽车材料教育部重点实验室,吉林,长春,130025
基金项目:华南理工大学自然科学基金资助项目(305-E5040440).
摘    要:利用挤压铸造法制备了单-A12O3短纤维增强及A12O3短纤维一石墨(Gr)颗粒混杂增强AZ91镁合金复合材料,考察了镁合金及其复合材料的滑动摩擦磨损性能.结果表明,复合材料的耐磨性能优于基体合金,其中单一A12O3短纤维增强复合材料的耐磨性能更优,而混杂Gr颗粒的复合材料在磨损表面不能形成自润滑薄膜,故不能改善镁基复合材料在滑动干摩擦条件下的摩擦磨损性能.基体合金和单一A12O3短纤维增强复合材料的主要磨损机制为犁削磨损,而A12O3-Gr颗粒混杂增强复合材料的主要磨损机制为犁削和剥层破坏.

关 键 词:镁合金  纤维  石墨颗粒  混杂增强金属基复合材料  摩擦磨损性能
文章编号:1004-0595(2004)04-0341-05
修稿时间:2003年11月20

Friction and Wear Properties of AZ91 Magnesium Alloy and Its Hybrid Composites Reinforced with Alumina Fiber and Graphite Particulates
DU Jun,LI Wen-fang,LIU Yao-hui,MIAO Yao-xin.Friction and Wear Properties of AZ91 Magnesium Alloy and Its Hybrid Composites Reinforced with Alumina Fiber and Graphite Particulates[J].Tribology,2004,24(4):341-345.
Authors:DU Jun  LI Wen-fang  LIU Yao-hui  MIAO Yao-xin
Institution:DU Jun~,LI Wen-fang~,LIU Yao-hui~,MIAO Yao-xin~
Abstract:The AZ91 magnesium-alloy-based composites reinforced with alumina short fiber and with hybrid alumina short fibre-graphite particulates were fabricated by squeeze-casting route.The friction and wear properties of the resulting AZ91 magnesium alloy and its composites sliding against SAE-52100 steel in unlubricated block-on-ring configuration were investigated on an MM-200 friction and wear tester.The morphologies of the original and worn surfaces of the composites were observed on a scanning electron microscope, while the elemental compositions thereon were determined by means of energy dispersive X-ray analysis. It was found that the incorporation of the alumina fiber or of the aluminar fiber-graphite particulates contributed to improve the friction and wear properties of the Mg-based alloy to different extents. The composites reinforced with the alumina short fiber alone showed the best wear resistance, while the inclusion of the graphite particulates together with the alumina fiber led to a decrease in the friction and wear properties of the Mg-based composites, though the composite reinforced with the aluminar fiber-graphite particulates still had better wear resistance than the alloy matrix. This could be because the graphite particulates were unable to form a solid lubricating layer on the worn surface of the soft Mg-based alloy. Moreover, the inclusion of the graphite particulates also caused differences in the wear mechanisms of the Mg-based alloy composites as well. Namely, the Mg-based alloy matrix and the composite reinforced with the alumina fiber alone was dominated by ploughing as they slid against the steel, while the ones reinforced with the alumina fiber-graphite particulates were characterized by less severe ploughing and delamination.
Keywords:magnesium alloy  alumina fiber  graphite particle  hybrid reinforced metal-matrix composites  friction and wear properties
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