摘要
采用搅拌摩擦加工技术通过加入Al_2O_3颗粒对AZ31镁舍金进行表面改性,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Al_2O_3/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,Al_2O_3颗粒均匀地分布在镁合金基体上,且与基体结合较好;Al_2O_3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。
Surface modification of AZ31 magnesium alloy was conducted by friction stir processing（FSP） and Al_2O_3 particles addition.The microstructure of surface composites,mechanical properties and the effect law of processing speed on the microstructure were studied.The results show that Al_2O_3/AZ31 surface composite layer could be successfully fabricated by the processing.Al_2O_3 particles were uniformly distributed in magnesium matrix and the surface composites had excellent bonding with the magnesium alloy substrate when the rotating rate was 1 500 r·min^（-1） and processing speed was 23.5 mm·min^（-1）.The grains were refined because of the excellent pinning effect of Al_2O_3 particles.The microhardness of composite surface was 55 HV,which was increased by 41% compared with that of the AZ31 substrate.Both the grain refinement and the reinforcement increased the microhardness.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第5期49-51,共3页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(50774059)
西安建筑科技大学材料加工工程重点学科资助项目(E04001)
关键词
搅拌摩擦加工
AZ31镁合金
显微组织
显微硬度
friction stir processing（FSP）
AZ31 magnesium alloy
microstructure
microhardness
