Intermetallic compounds precipitation behavior of water-cooled assisted Al/Mg dissimilar friction stir welding joints

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Mar.2026, Vol.49 No.3: 342-346

DOI: 10.3969/j.issn.1003-5060.2026.03.009

Authors

WU Anbang ¹, YASUI Toshiaki ², ZHANG Haochen ²

(1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; 2. Department of Mechanical Engineering, Toyohashi University of Technology, Toyohashi 441-8580, Japan)

Abstract and Keywords

Abstract: AZ31B/6061-T6 dissimilar alloys sheets with thickness of 2 mm were used to carry out friction stir butt welding, which were under atmosphere and water-cooled assisted conditions, respectively. The influence of water-cooled condition on the precipitation behavior of brittle intermetallic compounds (IMCs) in dissimilar friction stir welding (FSW) joints was studied. Results show that peak temperature and high temperature duration of joints under water-cooled condition were lower than those under atmospheric condition, which exhibited an average welding temperature of 350 °C at welding line and a faster cooling rate. Besides, the precipitation of brittle IMCs in water-cooled assisted FSW joints was decreased comparing to that under atmospheric condition, and the thickness of IMCs was apparently decreased. Specific heat capacity of water is high, which can effectively absorb welding heat and has a remarkable cooling effect. However, it also weakens the plastic flow of materials, which may lead to tunnel defects and induce quenching residual stress.

Keywords: aluminum/magnesium dissimilar alloys; friction stir welding(FSW); water-cooled assisted method; intermetallic compounds(IMCs); welding thermal cycle

作者信息

吴安邦 ¹，安井利明 ²，张昊晨 ²

(1. 东北大学材料各向异性与织构教育部重点实验室，辽宁沈阳 110819；2. 丰桥技术科学大学机械工学系，日本丰桥 441-8580)

摘要和关键词

摘要: 文章在大气与水冷辅助下分别对 2 mm 厚的 AZ31B/6061-T6 异种合金薄板进行搅拌摩擦对接焊接，并分析水冷对搅拌摩擦焊（friction stir welding，FSW）异质接头脆性金属间化合物（intermetallic compounds，IMCs）析出行为的影响。结果表明：水冷接头焊接时的峰值温度和高温停留时间均低于大气焊接时，焊缝平均焊接温度低于 $ 350\;^{\circ}C $，且温降速率更快；水冷辅助 FSW 接头脆性 IMCs 的析出量较大，辅助 FSW 有所减少，界面处 IMCs 层厚度显著降低；水的比热容较大，能够有效吸收焊接热，冷却效果显著，但也导致材料塑性流动遭到削弱，易引起接头隧道缺陷的发生以及诱发淬火残余应力。

关键词: 铝/镁异种合金；搅拌摩擦焊(FSW)；水冷辅助；金属间化合物(IMCs)；焊接热循环

Funding

特种焊接技术安徽省重点实验室开放基金资助项目（2023SW1002）

合肥工业大学学报(自然科学版)

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