Al-2.15％Mn合金的组织及摩擦学特性

采用搅拌法制备了Al-2.15 ％Mn合金,对其显微组织、强化机制及摩擦磨损性能进行了试验研究.结果表明:Al-2.15％Mn合金的组织为含Alu Mn4和Al6 Mn的α-Al固溶体；合金中Al6Mn的沉淀强化作用使其硬度较纯Al提高了60％；纯Al的冲击断口形貌为塑性断裂,Al-2.15％Mn合金的冲击断口形貌为准解理断裂；纯Al与Al-2.15％Mn合金在湿摩擦下的磨损量均大于干摩擦的磨损量；湿摩擦的腐蚀一机械磨损作用使磨痕为犁沟和蚀坑,干摩擦中磨屑的成片脱落由机械磨损中的黏着磨损引起；在干摩擦与湿摩擦中,纯Al的摩擦因数均大于Al-2.15％Mn合金的摩擦因数,Al-2.15％Mn合金较纯Al表现出更加优良的耐磨性.

Microstructure and Tribological Performance of Al-2.15%Mn Alloy

Al-2.15%Mn alloy was fabricated by stirring casting.Its microstructure,strengthening mechanism,and friction and wear behavior were investigated.The results show that: 1) The as-cast microstructure of Al-2.15%Mn alloy is composed of α-Al matrix with Al11Mn4 and Al6Mn compounds;2) The hardness of Al-2.15%Mn alloy gets 60% higher than that of pure aluminum because of deposition strengthening by Al6Mn;3) The impact fractures exhibit plastic morphology for pure aluminum and quasi-cleavage morphology for Al-2.15%Mn;4) The worn mass losses of both pure aluminum and Al-2.15%Mn alloy under lubricating condition are greater than that under dry condition because combination of corrosion and mechanical wear in wet friction condition generates furrows and corroded pits on sample surface,while adhesive wear in dry friction condition makes worn chips flake off the sample surface;5) Al-2.15%Mn alloy shows smaller friction coefficient and better wear resistance than pure aluminum in both wet and dry wears.