镁合金表面的搅拌摩擦加工改性
Surface Modification of Magnesium Alloy Performed by Friction Stir Processing
摘 要
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.
AZ31镁合金
显微组织
显微硬度
friction stir processing(FSP)
AZ31 magnesium alloy
microstructure
microhardness
Abstract
Surface modification of AZ31 magnesium alloy was conducted by friction stir processing(FSP)and Al2O3 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 Al2O3/AZ31 surface composite layer could be successfully fabricated by the processing.Al2O3 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 Al2O3 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.
中图分类号 TG146.2
所属栏目 新材料 新工艺
基金项目 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)
收稿日期 2009/4/16
修改稿日期 2009/10/23
网络出版日期
作者单位点击查看
备注郭韡(1984-),男,陕西兴平人,硕士研究生.
引用该论文: GUO Wei,WANG Kuai-she,WANG Wen,SUN Peng,WANG Wen-li. Surface Modification of Magnesium Alloy Performed by Friction Stir Processing[J]. Materials for mechancial engineering, 2010, 34(5): 49～51
郭韡,王快社,王文,孙鹏,王文礼. 镁合金表面的搅拌摩擦加工改性[J]. 机械工程材料, 2010, 34(5): 49～51
被引情况:
【1】瞿皎,陈靓瑜,孟强,伍来智,李雪璞,王立强,吕维洁, "工业纯钛板多道次搅拌摩擦加工区的组织及摩擦磨损性能",机械工程材料 40, 92-95(2016)
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参考文献
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【3】MISHRA R S,MA Z Y,CHARIT I.Friction stir processing: a novel technique for fabrication of surface composite[J].Materials Science and Engineering A,2003,341:307-310.
【4】MORISADA Y,FUJII H,NAGAOKA T,et al.Effect of friction stir processing with SiC particle on microstructure and hardness of AZ31[J].Materials Science and Engineering A,2006,433:50-54.
【5】MORISADA Y,FUJII H,NAGAOKA T,et al.MWCNTs/AZ31 surface composites fabricated by friction stir processing[J].Materials Science and Engineering A,2006,419:344-348.
【6】MORISADA Y,FUJII H,NAGAOKA T,et al.Nanocrysta-llized magnesium alloy-uniform dispersion of C60 molecules[J].Scripta Materialia,2006,55:1067-1070.
【7】LEE C J,HUANG J C,HSIEH P J.Mg based nano-compo-sites fabricated by friction stir processing[J].Scripta Materialia,2006,54:1415-1420.
【8】DIXIT M,NEWKIRK J W,MISHRA R S.Properties of fric-tion stir-processed Al 1100-NiTi composite[J].Scripta Materialia,2007,56:541-544.
【9】孙鹏,王快社,王文,等.工艺参数对AZ31镁合金搅拌摩擦加工微观组织的影响[J].热加工工艺,2008,37(5):99-101.
【10】郭韡,王快社,王文,等.搅拌摩擦加工铸态L2纯铝组织与性能研究[J].兵器材料科学与工程,2009,32(4):15-18.
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