J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (8): 743-746.

• Research Articles • 上一篇    下一篇

一种Zn-Mg-Al钎料钎焊镁合金AZ31B接头的显微组织和力学性能

马力1,贺定勇 2,李晓延1,蒋建敏3   

  1. 1. 北京工业大学
    2. 北京工业大学材料学院
    3. 北京工业大学材料科学与工程学院
  • 收稿日期:2009-11-17 修回日期:2010-01-20 出版日期:2010-08-28 发布日期:2010-08-23
  • 通讯作者: 马力
  • 基金资助:

    镁合金钎焊连接材料及工艺研究

Microstructure and Mechanical Properties of Magnesium Alloy AZ31B Brazed Joint Using a Zn-Mg-Al Filler Metal

Li Ma, Dingyong He, Xiaoyan Li, Jianmin Jiang   

  1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2009-11-17 Revised:2010-01-20 Online:2010-08-28 Published:2010-08-23
  • Contact: Li Ma
  • Supported by:

    the Beijing Municipal Education Commission (Grant No. KM200710005005)

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摘要：

为了连接同种镁合金AZ31B板材，一种新颖的Zn-Mg-Al钎料在氩气保护的高频感应加热方式下钎焊连接了镁合金AZ31B板材。分析了钎焊接头的显微组织、相组成和断口形貌。试验结果表明由于在钎焊过程中熔化的钎料和母材之间的强烈的合金化作用，在钎焊过程后在原始钎料中的MgZn2相消失，α-Mg固溶体和α-Mg + MgZn共析组织在钎焊区中生成。力学性能测试表明钎焊接头搭接平均剪切强度达到56MPa，钎焊接头的断裂形式为沿晶脆性断裂，断裂产生在硬的α-Mg+MgZn共析组织处。

关键词: 钎料, 钎焊, 显微组织, 力学性能

Abstract:

In order to join the similar magnesium alloy, a novel Zn-Mg-Al filler metal was designed and applied to braze AZ31B plates by using high-frequency induction brazing technique. The microstructure, phase constitution and fracture morphology of the brazed joint were investigated. The experimental results show that MgZn2 phase in the original filler metal is completely consumed in the brazing process. Moreover, α-Mg solid solution and α-Mg+MgZn eutectoid structure formed in the brazing region due to the intensive alloying between the molten filler metal and the base metal in the brazing process. Test results indicate that the shear strength of the brazed joint is 56 MPa. The fracture morphology of the brazed joint shows intergranular fracture mode, where crack originates from the hard α-Mg+MgZn eutectoid structure.

Key words: Filler metal, Brazing, Microstructure, Mechanical properties