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李佩琪,游国强,徐轩曦,丁煜瀚,文恒玉,郭伟.压铸态镁/铝异种金属搅拌摩擦焊接接头组织及性能[J].稀有金属材料与工程(英文),2019,48(5):1551~1558.[LI Peiqi,YOU Guoqiang,XU Xuan-xi,DING Yu-han,Wen Heng-yu and Guo Wei.Microstructure and properties of high-pressure die casting Mg/Al dissimilar friction stir welded joints[J].Rare Metal Materials and Engineering,2019,48(5):1551~1558.]
Microstructure and properties of high-pressure die casting Mg/Al dissimilar friction stir welded joints
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Received:September 23, 2018  Revised:October 29, 2018
DOI:
Key words: Friction stir welding  Microstructure  Mechanical properties  High-pressure die casting alloy magnesium alloy  High-pressure die casting aluminum alloy
Foundation item:重庆市基础研究与前沿探索项目,项目号cstc2018jcyjA3203; 留学人员回国创业创新支持计划专项,项目号201412150129.
Author NameAffiliation
LI Peiqi,YOU Guoqiang,XU Xuan-xi,DING Yu-han,Wen Heng-yu and Guo Wei  
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Abstract:
      The high-pressure die castings of AZ91 Mg and ADC12 Al alloys of 3 mm were welded by frciton stir welding. OM、SEM/EDS、XRD and universal tensile testing machine were used to analyze the microstructure and tensile property of the joint. The main conclusins are: 1). Defect-free welded joints were obtained when ADC12 die-casting aluminum alloy was placed in advancing side with a welding speed of 40mm/min and the rotational speeds of 900-1300r/min. 2). Mg and Al alloys are mixed with each other in the nugget zone, and mechanical interlocking occurs. In the parent material, the thick and large casting dendrites are obviously refined, and the non-Mg/Al matrix phases mainly include Si, Mg2Al3, Mg17Al12 and Mg2Si. 3) The average tensile strength of the joints increased first and then decreased with the increase of rotating speed. Fracture occurred at the interface of the thermal affceted zone and the nugget zone in advancing side.