| 摘要: |
| 采用Zn-Al钎料和自制KAlF4-CsAlF4钎剂配合火焰钎焊方法对紫铜和纯铝进行钎焊,研究了钎料中铝含量变化对钎料铺展性能、钎料组织及钎焊接头力学性能的影响.结果表明,钎料中铝含量质量分数为15%时,钎焊接头力学性能最佳.采用光学显微镜和场发射扫描电子显微镜进一步观察分析钎料组织、铜铝钎焊接头区域显微组织和铜侧界面层化合物的分布形态,并采用EDS进行成分分析.当钎料中铝含量较低时,铜铝钎焊接头区域主要由锌基固溶体构成,随着铝含量的升高,钎缝内部出现硬脆的CuAl2相,当铝含量质量分数达到22%时,CuAl2相尺寸变得粗大且分布不均匀,钎焊接头强度降低. |
| 关键词: 铜铝接头 力学性能 显微组织 CuAl2相 |
| DOI： |
| 分类号: |
| 基金项目:科技部科技人员服务企业行动基金资助项目(2009GJC20040) |
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| Effect of CuAl2 phase on properties and microstructure of Cu/Al brazed joint |
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ZHANG Man1,2, XUE Songbai1, JI Feng1, LOU Yinbin3, WANG Shuiqing3
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1.College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2.College of Mechanical Engineering, Huaiyin Institute of Technology, Huaian 223001, China;3.Zhejiang Xinrui Welding Material Co., Ltd., Shengzhou 312000, China
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| Abstract: |
| Cu/Al dissimilar metals were brazed with Zn-Al filler metals by torch-brazing technology,and the effects of Al on the spreadability and microstructure of Zn-Al filler metal were investigated separately.Moreover,the strength and microstructure of the brazed joint were also studied.Results indicate that the strength of the brazed joints achieves the optimum status when the Al content of filler metals is 15%.SEM and EDS are used to study the microstructure and phase constitution of the filler metals and brazed joints respectively.Experimental results show the microstructures of brazed joints are mainly consisted of Zn-based solid solution when Al content is low.However,CuAl2 intermetallic compounds can form in the brazing seam region with increase of Al content.When Al content is 22 wt.%,CuAl2 intermetallic compounds become coarse,and the strength of brazed joint decreases. |
| Key words: Cu/Al brazed joint mechanical property microstructure CuAl2 phase |
