采用搅拌摩擦加工技术通过加入Al2O3颗粒对AZ31镁合金进行表面改性,研究了表面复合层的显微组织、力学性能及加工速度对显微组织的影响规律.结果表明:采用该技术可在合金表面成功制备出Al2O3/AZ31表面复合层,当搅拌头的旋转速度为1 500 r·min-1、加工速度为23.5 mm·min-1时,Al2O3颗粒均匀地分布在镁合金基体上,且与基体结合较好;Al2O3颗粒对再结晶晶粒的晶界起到钉扎作用,可显著细化晶粒;得到的表面复合层的显微硬度为55 HV,比母材硬度提高41%,细晶强化和颗粒强化对硬度的提高起着主要作用.
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