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材料工程  2015, Vol. 43 Issue (3): 18-22    DOI: 10.11868/j.issn.1001-4381.2015.03.004
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
镁铝异种金属TIG焊接头性能的研究
刘政军, 宫颖, 苏允海
沈阳工业大学 材料科学与工程学院, 沈阳 110870
Study on Characteristics in TIG Welded Joint of Mg/Al Dissimilar Materials
LIU Zheng-jun, GONG Ying, SU Yun-hai
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
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摘要 采用TIG焊对镁和铝分别以铝焊丝和锌焊丝作为填充金属进行异种焊接,利用扫描电镜(SEM)、X射线衍射(XRD)及显微硬度计等设备对其组织和性能进行分析和比较。结果表明:铝丝焊接时,Mg侧过渡区清晰可见,宽度约为300μm,镁铝元素相互扩散在过渡区形成Mg17Al12和Al3Mg2,此金属间化合物的生成使接头容易发生断裂。采用锌丝焊接时,镁锌界面清晰,锌铝过渡区为宽度约2μm的固溶体层,Zn元素的存在可有效阻止镁铝元素的相互扩散,减小过渡层的厚度,阻止金属间化合物的形成。
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刘政军
宫颖
苏允海
关键词 镁合金铝合金焊接扩散    
Abstract:TIG welding was carried out to weld aluminum and magnesium by using aluminum and zinc wires, respectively. The microstructures and properties were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and microhardness tester. The result shows that an obvious transition region with the width of about 300μm is clearly visible at Mg side while using aluminum wire. Besides, the interdiffusion between magnesium and aluminum results in the presence of fragile Mg17Al12 and Al3Mg2 intermetallics in the transition region, which makes the interface of the welded joint easy to fracture. Whereas, the interface between magnesium and zinc is clear and a solid solution layer with width of about 2μm is generated in the transition region between zinc and aluminum while using zinc wire. The existence of zinc prevents the interdiffusion between magnesium and aluminum and decreases the thickness of the transition region effectively, which restrains the formation of intermetallics.
Key wordsmagnesium alloy    aluminum alloy    weld    diffusion
收稿日期: 2013-06-01     
1:  TG457.1  
基金资助:辽宁省自然科学基金资助项目(20072041)
通讯作者: 刘政军(1962-),男,教授,博士,主要从事焊接冶金、特种焊接材料及表面强化方向的研究,联系地址:沈阳经济技术开发区沈辽西路111号沈阳工业大学材料科学与工程学院(110870),liuzhengjun1962@163.com     E-mail: liuzhengjun1962@163.com
引用本文:   
刘政军, 宫颖, 苏允海. 镁铝异种金属TIG焊接头性能的研究[J]. 材料工程, 2015, 43(3): 18-22.
LIU Zheng-jun, GONG Ying, SU Yun-hai. Study on Characteristics in TIG Welded Joint of Mg/Al Dissimilar Materials. Journal of Materials Engineering, 2015, 43(3): 18-22.
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http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2015.03.004      或      http://jme.biam.ac.cn/jme/CN/Y2015/V43/I3/18
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