An innovative joint interface design for reducing intermetallic compounds and improving joint strength of thick plate friction stir welded Al/Mg joints  

作　　者：Yang Xu Liming Ke Yuqing Mao Jifeng Sun Yaxiong Duan Limin Yu 

机构地区：[1]National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,PR China [2]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,PR China

出　　处：《Journal of Magnesium and Alloys》2023年第9期3151-3160,共10页镁合金学报（英文）

基　　金：supported by the National Natural Science Foundation of China (No.51874179,52005240 and 52164045);the Young Talent Program of Major Disciplines of Academic and Technical Leaders in Jiangxi Province (No.20212BCJ23028)。

摘　　要：Friction stir welding of dissimilar Al/Mg thick plates still faces severe challenges, such as poor formability, formation of thick intermetallic compounds, and low joint strength. In this work, two joint configurations, namely inclined butt(conventional butt) and serrated interlocking(innovative butt), are proposed for improving weld formation and joint quality. The results show that a continuous and straight intermetallic compound layer appears at the Mg side interface in conventional butt joint, and the maximum average thickness reaches about 60.1 μm.Additionally, the Mg side interface also partially melts, forming a eutectic structure composed of Mg solid solution and Al_(12)Mg_(17) phase.For the innovative butt joint, the Mg side interface presents the curved interlocking feature, and intermetallic compounds can be reduced to less than 10 μm. The joint strength of innovative butt joint is more than three times that of conventional butt joint. This is due to the interlocking effect and thin intermetallic compounds in the innovative joint.

关 键 词：Al/Mg joint Friction stir welding Thick plate Intermetallic compounds Joint strength 

分 类 号：TG453.9[金属学及工艺—焊接]