AZ91D镁合金微动磨损特性研究

采用液压高精度材料试验机考察了平面一球面接触的AZ91D镁合金摩擦副的微动磨损行为，分析了位移幅值、法向载荷和频率等参数对摩擦因数和磨损体积的影响，考察了不同实验条件下的磨斑形貌，并探讨了其磨损机理。结果表明：AZ91D镁合金的微动区域可分为部分滑移区、混合区和滑移区3个区域，粘着磨损、疲劳磨损和磨粒磨损分别是3个区域的主要磨损机制；磨损体积随着位移幅值和法向载荷的增加而增大，但却随着频率的增大而减小。在微动部分滑移区和混合区，摩擦因数随着位移增大迅速增加；在微动滑移区，摩擦因数随法向载荷的增大而减小，而位移幅值和频率对摩擦因数的影响较小。

Fretting Wear Characteristics of AZ91D Magnesium Alloy

The fretting wear behavior of AZ91D magnesium alloy pair in a plane-on-ball configuration was investigated on a universal material tester of highly accurate displacement control. The effects of amplitude of slip, normal load and frequency on friction coefficient and wear volume were analyzed, the rubbed surfaces under different experimental condition were investigated using Scanning Electron Microcopy and Optical Microcopy,and the wear mechanisms of AZ91D magnesium alloy were also discussed. The results indicate that the fretting wear zone of AZ91D magnesium alloy can be divided into three zones, accordingly, partial slip zone, mixed zone and slip zone. Adherence wear, fatigue wear and abrasive wear are respectively dominative mechanism in the above three zone. The wear volume increases as the increase of amplitude of slip and normal load, but decreases as an increase of frequency. In the partial slip zone and mixed zone, the friction coefficient rapidly increases as the displacement, and in the slip zone of fretting, the friction coefficient decreases as the increase of normal load, the displacement of slip and fretting frequency has less effect on the friction coefficient.