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在20~200℃温度下,利用销盘式磨损试验机研究Mg-3Al-0.4Si合金的磨损行为,评价载荷和温度对磨损速率的影响.应用扫描电子显微镜观察磨损表面形貌以确定高温下的磨损机制,通过光学显微镜观察磨损亚表层组织演变,然后采用显微硬度计测量硬度变化.研究结果表明:随着磨损温度提高,Mg-3Al-0.4Si合金的磨损率随载荷增加而上升的趋势更为明显.其磨损行为可分为轻微和严重磨损,增加磨损温度显著降低轻微-严重磨损转变载荷.轻微-严重磨损前后的亚表层组织和硬度变化表明,摩擦热诱发磨损亚表层发生动态再结晶(DRX)组织转变引起的热软化是造成轻微-严重磨损转变的主要原因.
The wear behavior of Mg-3Al-0.4Si alloy was investigated by pin-on-disk wear tester at 20 ~ 200 ℃, and the influence of load and temperature on the wear rate was evaluated. The wear surface morphology was observed with scanning electron microscope , The microstructure evolution of the worn subsurface structure was observed by light microscopy and the hardness was measured by microhardness tester.The results show that the wear rate of Mg-3Al-0.4Si alloy increases with the increase of wear temperature as the wear temperature increases The trend is more obvious.The wear behavior can be divided into mild and severe wear, increase the wear temperature significantly reduce the mild - severe wear transition load.Slight - severe wear before and after the subsurface tissue and hardness changes show that frictional heat induced wear sub-surface layer dynamic Thermal softening due to recrystallization (DRX) tissue turnover is a major cause of mild-to-severe wear changes.