Softening issue in the thick-plate friction pull plug welding of AA2219-T87

IF 4.4 3区工程技术 Q1 ENGINEERING, CIVIL

Archives of Civil and Mechanical Engineering Pub Date : 2024-11-13 DOI:10.1007/s43452-024-01065-7

Xinyu Liang, Zhijiang Wang, Lei Cui, Zhixiong Lin, Zhendong Chen, Feng Zhang, Zhen Shao, Lijun Yang, Yongliang Chen, Yiming Huang, Caiyan Deng

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Abstract

The softening of aluminum alloy is an important factor affecting its service life. In the present work, the softening characteristics and mechanism in the friction pull plug welding (FPPW) joint of AA2219-T87 plate with a nominal thickness of 18 mm were studied, and an effective measure to mitigate the softening issue was proposed. The softening zone in the thick-plate FPPW joint is located in thermo-mechanically affect zone near the bonding interface and is 6–12 mm away from the top surface of the plate. The disappearance of the strengthening transition phase θ′ is the main cause for the softening; the degree of dynamic recrystallization, which influences the grain size and the work hardening, also affects the softening; but solid solution of Cu atoms in α-Al has little effect on the hardness change in the softening zone. After optimizing the geometric structure of joint and FPPW process parameters, the softening zone was still the weakest point of the joint. After solution and aging treatment on the above-mentioned optimized joint, the minimum hardness in the softening zone increased from 76 HV₁ to 95 HV₁, the tensile strength increased from 318 to 355 MPa, and the fracture position shifted from the softening zone to the plug.

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AA2219-T87 厚板摩擦拉塞焊接中的软化问题

铝合金的软化是影响其使用寿命的一个重要因素。本研究对公称厚度为 18 毫米的 AA2219-T87 厚板摩擦拉塞焊（FPPW）接头的软化特性和机理进行了研究，并提出了缓解软化问题的有效措施。厚板 FPPW 接头的软化区位于粘接界面附近的热机械影响区，距离板顶面 6-12 mm。强化转变相θ′的消失是软化的主要原因；影响晶粒大小和加工硬化的动态再结晶程度也会影响软化；但铜原子在α-Al中的固溶对软化区的硬度变化影响不大。在优化接头几何结构和 FPPW 工艺参数后，软化区仍是接头的最薄弱点。对上述优化后的接头进行固溶和时效处理后，软化区的最低硬度从 76 HV1 提高到 95 HV1，抗拉强度从 318 MPa 提高到 355 MPa，断裂位置从软化区转移到塞子上。

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来源期刊

Archives of Civil and Mechanical Engineering 工程技术-材料科学：综合

CiteScore

6.80

自引率

9.10%

发文量

201

审稿时长

4 months

期刊介绍： Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science. The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics. The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation. In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.