• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (4): 11-17.doi: 10.3901/JME.2017.04.011

• 异种材料的焊接与连接 • 上一篇    下一篇

线性摩擦焊AA5083铝合金/T2纯铜异质接头
特征研究*

马铁军1,2, 刘亚森1,2, 李文亚1,2, 张勇1,2, 王刚1,2   

  1. 1. 西北工业大学凝固技术国家重点实验室 西安 710072;
    2. 西北工业大学摩擦焊接陕西省重点实验室 西安 710072
  • 出版日期:2017-02-20 发布日期:2017-02-20
  • 作者简介:

    马铁军,男,1972年出生,副教授,硕士研究生导师。主要从事压力焊工艺及设备方面的研究。

    E-mail:matiejun@nwpu.edu.cn

  • 基金资助:
    * 凝固技术国家重点实验室自主课题资助项目(122-QZ-2015); 20161010收到初稿,20161209收到修改稿;

Characteristics of Linear Friction Welded AA5083 Aluminium Alloy-T2 Pure Copper Dissimilar Joint

MA Tiejun1,2, LIU Yasen1,2, LI Wenya1,2, ZHANG Yong1,2, WANG Gang1,2   

  1. 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072;
    2. Shannxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072
  • Online:2017-02-20 Published:2017-02-20

摘要:

对AA5083铝合金/T2纯铜进行不同焊接压力下的线性摩擦焊试验,结果表明:焊接过程主要以铝合金的压缩变形为主,T2变形量较小。焊缝处界限分明,两侧晶粒均明显细化,铝侧细化程度更高且金属流线消失。焊缝界面可观察到明显的孔洞缺陷,且随摩擦压力的增大孔洞逐渐减小直到消失。接头拉伸强度达到T2母材的50%,接头伸长率很低,拉伸断裂均发生在焊缝区,断裂形式均为脆性断裂。微区成分分析可知,Al/Cu界面处存在厚度大约为2 μm扩散层;界面附近Al侧出现以Cu粒子与金属间化合物弥散的机械混合组织,厚度在100~500 μm浮动。接头强度较低的主要原因是存在界面孔洞缺陷及金属间化合物混合组织。

关键词: AA5083铝合金, T2纯铜, 金属间化合物, 线性摩擦焊

Abstract:

The joining of AA5083/T2 dissimilar materials is carried out by linear friction welding under different welding pressures. Results show that the compression deformation is mainly at the aluminum alloy side, while that of T2 is relatively small. There is a clear narrow weldline at the welding interface with some obvious micropores. The streamline disappears at the aluminum alloy side closing to the weldline, and the grains near the weldline are significantly refined. The tensile strength of joints reaches to 50% of pure copper with low ductility, and the tensile fracture has occurred at the weld zone in a brittle mode. Elements analysis show that: a diffusion layer between Al and Cu is about 2 μm; Cu particles and a large amount of mechanically mixed intermetallics exist at the Al side near the weldline and the thickness is 100 to 500 μm. Pore defects and intermetallics are the main reason of low strength.

Key words: AA5083 alloy, intermetallic, T2 pure copper, linear friction welding