• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (6): 17-23.doi: 10.3901/JME.2020.06.017

• 铝与镁/铜合金的焊接 • 上一篇    下一篇

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铝/铜电弧熔钎焊接头界面组织及演变研究

黄健康1,2, 杨涛1, 于晓全2, 王梓懿2, 樊丁1,2   

  1. 1. 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室 兰州 730050;
    2. 兰州理工大学材料科学与工程学院 兰州 730050
  • 收稿日期:2019-08-24 修回日期:2019-10-08 出版日期:2020-03-20 发布日期:2020-05-12
  • 作者简介:黄健康,男,1981年出生,副教授。主要研究方向为异种金属焊接、焊接过程控制和焊接物理等,发表论文200余篇。E-mail:sr2810@163.com;
    于晓全,男,1989年出生,博士研究生。主要研究方向为异种金属焊接及其界面行为,发表论文5篇。E-mail:yuxiaoquangood@163.com;
    樊丁,男,1961年出生,教授,博士研究生导师。主要研究方向为焊接物理,焊接方法与智能控制及激光加工等,发表论文300余篇。E-mail:fand@lut.cn
  • 基金资助:
    国家自然科学基金资助项目(51865029)。

Study of Interfacial Microstructure and Phase Evolution of Al/Cu Arc Welding-brazing Joint

HUANG Jiankang1,2, YANG Tao1, YU Xiaoquan2, WANG Ziyi2, FAN Ding1,2   

  1. 1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050;
    2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050
  • Received:2019-08-24 Revised:2019-10-08 Online:2020-03-20 Published:2020-05-12

摘要: 采用旁路耦合电弧焊方法实现了铝合金与紫铜的熔钎焊,并研究焊后退火下铝/铜界面组织的演变。采用扫描电镜观察焊后及不同退火工艺下界面微观组织的形貌,同时,通过能谱仪及X射线衍射对界面的物相进行确定,并通过蒙特卡洛结合原胞自动机方法建立界面金属间化合物的热力学-动力学模型,分析了界面组织的演变行为。结果表明,通过旁路耦合电弧方法可实现铝/铜的熔钎焊,铝/铜焊接接头经250~400℃退火3 h后,界面处最终形成CuAl、Cu9Al4和CuAl2三种金属间化合物,随着退火温度的增加,界面金属间化合物厚度呈线性增加,最大厚度为38.39 μm,铜-铝界面金属间化合物的形成由原子间互扩散和界面化学反应共同决定。

关键词: 铜/铝焊接接头, 退火, 微观组织, 界面演变

Abstract: Using a bypass coupled arc method, an aluminum plate is joined to a red copper plate, and the evolution of interfacial microstructure is studied after post-weld annealing. The morphologies of interfacial microstructure for welding and annealing state are observed by scanning electron microscopy, and the interfacial phase is identified by energy dispersive spectrometer and X-ray diffraction methods. The thermodynamic-dynamic model of intermetallic compounds at the interface is established by Monte Carlo combining Cellular Automata, and the evolution behavior of intermetallic compounds is analyzed. The results show that a welding-brazing joint can be obtain by bypass coupled arc method, three kinds of intermetallic compounds of CuAl, Cu9Al4, and CuAl2 are formed at the interface of Al/Cu weld joint after annealing for 3 hours at 250-400 ℃. With the increase of annealing temperature, the intermetallic compound thickness at the interface increases, and the maximum thickness is 38.39μm. The inter-diffusion and interface chemical reaction determine the formation of intermetallic compounds at the copper-aluminum interface.

Key words: Cu/Al weld joint, annealing, microstructure, interface evolution

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