| 压铸态AZ91D镁合金搅拌摩擦焊接头微观组织研究 |
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| 引用本文： | 游国强,张均成,王向杰,陈勇.压铸态AZ91D镁合金搅拌摩擦焊接头微观组织研究[J].材料工程,2012(5):54-58. |
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| 作者姓名： | 游国强 张均成 王向杰 陈勇 |
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| 作者单位： | 1. 重庆大学材料科学与工程学院,重庆400045;重庆大学国家镁合金材料工程技术研究中心,重庆400044
2. 重庆大学材料科学与工程学院,重庆,400045 |
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| 基金项目： | 中央高校基本科研业务经费资助项目(CDJZR12130053) |
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| 摘 要： | 采用搅拌摩擦焊工艺对4mm厚的压铸态AZ91D镁合金进行对接工艺实验,搅拌头旋转速率1500r/min,焊接速率120mm/min;使用光学显微镜和扫描电镜对焊接接头微观组织进行了研究。结果表明:焊缝外观成形美观,但内部存在贯穿型隧道状孔洞缺陷;焊核区为典型的变形-再结晶组织,为细小、均匀的等轴晶;机械-热影响区为变形-部分再结晶组织,热影响区组织形貌与母材相近但伴有轻微的长大现象;焊核区与机械-热影响区的过渡具有以下特征:在前进侧呈现"突变"特征,在后退侧呈现"渐变"特征。
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| 关 键 词： | AZD 压铸态镁合金 搅拌摩擦焊 微观组织 |
Microstructure of FSW Joint of Die-casting AZ91D Magnesium Alloy |
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| YOU Guo-qiang
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ZHANG Jun-cheng
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WANG Xiang-jie
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CHEN Yong.Microstructure of FSW Joint of Die-casting AZ91D Magnesium Alloy[J].Journal of Materials Engineering,2012(5):54-58. |
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| Authors: | YOU Guo-qiang ZHANG Jun-cheng WANG Xiang-jie CHEN Yong |
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| Affiliation: | 1(1 College of Materials Science and Engineering,Chongqing University, Chongqing 400045,China;2 National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China) |
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| Abstract: | Die casting plates of AZ91D magnesium alloy,with thickness of 4mm,were welded by friction stir welding,with a rotating speed of 1500r/min and welding speed of 120mm/min.The joint microstructure was studied by OM and SEM.The results show that the appearance of the welding joint is good,but there is a tunnel defect in the joint.The joint microstructure exhibits noticeable deformation characteristics: the grains of weld nugget zone are fine and recrystallized.Thermo-mechanically affected zone shows partially recrystallized microstructure.The microstructure of heat affected zone is similar to that of the base metal while the grains are a little coarser.Moreover,the transition between the weld nugget zone and the thermo-mechanically affected zone in the advancing side is discontinuous,while that in the retreating side is gradient. |
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| Keywords: | AZ91D die-casting magnesium alloy friction stir welding microstructure |
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