| 光纤激光焊接AZ91D镁合金接头微观组织特征 |
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| 引用本文： | 刘军,董俊慧,Shinozaki K. 光纤激光焊接AZ91D镁合金接头微观组织特征[J]. 稀有金属材料与工程, 2009, 38(Z3) |
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| 作者姓名： | 刘军 董俊慧 Shinozaki K |
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| 作者单位： | 1. 内蒙古工业大学,内蒙古,呼和浩特,010051
2. 日本广岛大学,日本,广岛,7398527 |
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| 基金项目： | 内蒙古自治区高等学校科学研究项目 |
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| 摘 要： | 采用光纤激光焊接AZ91D镁合金,借助金相显微镜、X射线衍射仪、扫描电镜、透射电镜分别对焊接接头的微观组织结构、相组成、断口形貌进行分析.结果表明:光纤激光焊接AZ91D镁合金,能够得到无明显缺陷的焊接接头,焊缝组织为细小的柱状晶组织,接头热影响区小.焊缝组织由过饱和α-Mg固溶体和Al_2Mg相组成,焊缝金属冷却速度较快,没有β-Mg_(17)Al_(12)脆性相析出.α-Mg晶内和晶界上有少量Al_2Mg析出物,且存在大量位错线和位错胞.断口特征为韧脆混合断裂形式,有微小裂纹存在.
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| 关 键 词： | 光纤激光焊接 镁合金 显微组织 |
Microstructure Characteristics of Fiber Laser Welding for AZ91D Mg Alloy |
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| Liu Jun,Dong Junhui,Shinozaki K. Microstructure Characteristics of Fiber Laser Welding for AZ91D Mg Alloy[J]. Rare Metal Materials and Engineering, 2009, 38(Z3) |
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| Authors: | Liu Jun Dong Junhui Shinozaki K |
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| Affiliation: | Liu Jun1,Dong Junhui 1,Shinozaki K2 (1. Inner Mongolia University of Technology,Huhhot 010051,China) (2. Hiroshima University,Hiroshima 7398527,Japan) |
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| Abstract: | The microstructure, phase composition and fracture surface of joint of Mg alloy AZ91D by fiber laser welding were investigated by the metallographic microscope, XRD, SEM and TEM. The results show that sound welds without major defects can be produced, the microstructures of weld metal are significantly finer columnar crystals grain and no obvious heat effected zone is found. The microstructure of weld seam is composed of the oversaturated α-Mg solid solution and Al_2Mg phase. No brittle phase of β-Mg_(17)Al_(12) is precipitated due to rapid cooling speed. The second phase of Al_2Mg distributed inside the α-Mg grains and located at the grain boundaries. Lots of dislocation lines and dislocation cells exist in α-Mg grains. The fracture surface shows mixture fracture with small crack. |
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| Keywords: | fiber laser weld Mg alloy microstructure |
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