[1]李海宁,周 伟,华　鹏,等.Al/Mg搅拌摩擦焊接接头组织及性能研究[J].焊管,2022,45(2):25-31.[doi:10.19291/j.cnki.1001-3938.2022.02.004]
　LI Haining,ZHOU Wei,HUA Peng,et al.Research on Microstructure and Properties of Al/Mg Friction Stir Lap Welded Joints[J].,2022,45(2):25-31.[doi:10.19291/j.cnki.1001-3938.2022.02.004]
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Al/Mg搅拌摩擦焊接接头组织及性能研究()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
45
期数:
2022年第2期
页码:
25-31
栏目:
试验与研究
出版日期:
2022-02-28

文章信息/Info

Title:
Research on Microstructure and Properties of Al/Mg Friction Stir Lap Welded Joints
文章编号:
10.19291/j.cnki.1001-3938.2022.02.004
作者:
李海宁; 周 伟; 华　鹏; 王云龙; 李先芬; 李玉虎
1. 合肥工业大学 材料科学与工程学院，合肥 230009；2. 南洋理工大学 机械与航空学院，新加坡 639798
Author(s):
LI Haining;  ZHOU Wei;  HUA Peng;  WANG Yunlong;  LI Xianfen;  LI Yuhu
1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; 2. School of Mechanics and Aeronautics, Nanyang Technological University, Singapore 639798, Singapore
关键词:
搅拌摩擦焊; 5052铝合金; AZ31镁合金; Zn中间层
Keywords:
friction stir welding;  5052 aluminum alloy;  AZ31 magnesium alloy;  Zn intermediate layer
分类号:
TG406
DOI:
10.19291/j.cnki.1001-3938.2022.02.004
文献标志码:
A
摘要:
针对5052铝合金/AZ31镁合金，进行了异种搅拌摩擦焊搭接试验，通过宏观和微观分析、硬度和拉剪力测试探究了Zn中间层对于铝/镁搭接接头组织和性能的影响。结果显示，焊缝搅拌区底部形成了厚度较均匀的金属间化合物（intermetallic compounds, IMCs）层，未加Zn层时，IMCs层由铝基体、尺寸较大呈条带状的Al3Mg2及网格状Al12Mg17化合物组成，拉剪力为3.9 kN，断裂方式为解理脆性断裂；加入Zn层后，IMCs厚度随Zn中间层厚度的增加而增加，IMCs层厚度最小为330 μm，内部主要由网格状Al12Mg17组成，网格状内部出现了小尺寸颗粒状的Mg-Zn以及Al-Mg-Zn IMCs；焊缝截面水平方向，搅拌区硬度为160HV，垂直方向硬度值最高达210HV，拉剪力最大值为4.79 kN。研究表明，生成的Mg-Zn和Al-Mg-Zn IMCs是导致拉剪力较未加Zn层时提高20%的主要原因。
Abstract:
The dissimilar friction stir welding lap test was carried out for 5052 aluminum alloy/AZ31 magnesium alloy. The effect of Zn interlayer on the microstructure and properties of aluminum/magnesium lap joint was explored through macro and micro analysis, hardness and tensile shear test. The results show that the Intermetallic Compounds (IMCs) layer with uniform thickness is formed at the bottom of the weld stirring zone. Without Zn layer, the IMCs layer is composed of aluminum matrix, strip Al3Mg2 and grid Al12Mg17 compound with large size. The tensile shear force is 3.9 kN and the fracture mode is cleavage brittle fracture. After adding Zn layer, the thickness of IMCs increases with the increase of Zn interlayer thickness. When adding Zn, the minimum thickness of IMCs layer is 330 μm. The IMCs layer is mainly composed of grid Al12Mg17, and there are small-size granular Mg-Zn and Al-Mg-Zn IMCs in the grid. In the horizontal direction of the weld section, the hardness of the mixing zone is 160 HV, the hardness value in the vertical direction is up to 210 HV, and the maximum tensile shear force is 4.79 kN. The results show that the generated Mg-Zn and Al-Mg-Zn IMCs are the main reasons for the increase of tensile shear force by 20% compared with that without Zn layer.

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备注/Memo

备注/Memo:
收稿日期：2021-08-02基金项目： 安徽省自然科学基金资助项目“铁素体耐热钢搅拌摩擦焊接接头组织演变和性能特征研究”（项目编号1808085ME150）。作者简介：李海宁（1996—），男，硕士研究生在读，主要从事搅拌摩擦焊接研究。
更新日期/Last Update: 2022-03-03