MIG welding microstructure, residual stress and mechanical properties of powder metallurgy 7A52 aluminum alloys

杨竞涵，计鹏飞，吴林阳，丁啸云，焦进超， 崔梦辉，陈星宇，张 津，连 勇，郑 林，窦世涛

doi:10.1016/S1003-6326(25)66829-4

Transactions of Nonferrous Metals Society of China >

2025 , Vol. 35 >Issue 8: 2500 - 2520

DOI: https://doi.org/10.1016/S1003-6326(25)66829-4

Materials Science and Engineering

MIG welding microstructure, residual stress and mechanical properties of powder metallurgy 7A52 aluminum alloys

杨竞涵，计鹏飞，吴林阳，丁啸云，焦进超，崔梦辉，陈星宇，张津，连勇，郑林，窦世涛

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1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing,Beijing 100083, China;
2. Beijing Key Laboratory of Corrosion, Erosion and Surface Technology,
University of Science and Technology Beijing, Beijing 100083, China;
3. National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing,Beijing 100083, China;
4. Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China;
5. Southwest Technology and Engineering Research Institute, Chongqing 400039, China

Online published: 2025-11-04

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Abstract

The MIG welding of in-situ generated nano-Al₂O₃ powder metallurgy 7A52 (PM 7A52) aluminum alloy was investigated. The microstructure was characterized using EBSD and TEM, while macrotexture and internal residual stresses were analyzed with a self-developed SWXRD technique. The results revealed that PM 7A52 aluminum alloy effectively reduced the grain size, dislocation density, and texture strength in the post-weld microstructure. Furthermore, the residual stress in the weld zone (WZ) of PM 7A52 aluminum alloy was reduced by 38 MPa compared to that of the conventional melt-cast 7A52 (CM 7A52) aluminum alloy. Notably, the tensile strength and elongation of welded joints in PM 7A52 aluminum alloy were increased by approximately 15% and 26%, respectively. The improvement in joint tensile strength was primarily attributed to grain boundary strengthening and dispersion strengthening caused by γ-Al₂O₃ particles entering the WZ.

Key words： powder metallurgy 7A52 aluminum alloy; MIG welding; SWXRD technique; texture; residual stress; mechanical properties

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杨竞涵，计鹏飞，吴林阳，丁啸云，焦进超，崔梦辉，陈星宇，张津，连勇，郑林，窦世涛 . MIG welding microstructure, residual stress and mechanical properties of powder metallurgy 7A52 aluminum alloys[J]. Transactions of Nonferrous Metals Society of China, 2025 , 35(8) : 2500 -2520 . DOI: 10.1016/S1003-6326(25)66829-4

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