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为研究铸轧镁合金AZ41板材的摩擦磨损性能,通过连铸连轧制备出镁合金AZ41板材,并观察其铸轧态和热处理态的微观组织结构特点。研究了滑动干摩擦条件下滑动速度和载荷对AZ41镁合金板材摩擦磨损性能的影响,采用扫描电镜观察磨损表面形貌,探讨了其磨损机制,并利用有限元方法模拟了其磨损时的应力分布。结果表明:制备的镁合金AZ41在(1012)上出现了大量压缩孪晶,经热处理后晶粒变为等轴晶;摩擦系数随着转速的增加而升高,在一定范围内随载荷的增加而降低;磨损量随着载荷和转速的增加而增加,低载时磨损机制为磨粒磨损,伴有氧化磨损的发生,高载时其磨损以粘着磨损为主。
In order to study the friction and wear properties of cast magnesium alloy AZ41, the AZ41 magnesium alloy sheet was prepared by continuous casting and rolling. The microstructure of cast AZ31 magnesium alloy was observed. The effects of sliding speed and load on the friction and wear properties of AZ41 magnesium alloy sheet were studied under sliding dry friction conditions. The wear surface morphology was observed by scanning electron microscopy, and the wear mechanism was discussed. The stress distribution during wear was simulated by finite element method . The results show that a large amount of compressive twins appear on the (1012) AZ31 magnesium alloy and the grains become equiaxed grains after heat treatment. The friction coefficient increases with the increase of the rotational speed and increases with the increase of the load within a certain range While the wear rate increases with the increase of load and speed. The wear mechanism of low load is abrasive wear, accompanied by the occurrence of oxidative wear, and the wear is mainly adhesive wear under high load.