Analysis of residual stress in 6061 Aluminum alloy and Kovar alloy soldered joints

6061铝合金与可伐合金钎焊接头残余应力分析 Analysis of residual stress in 6061 Aluminum alloy and Kovar alloy soldered joints 张阳阳 ZHANG Yangyang 1 2 first-author 胡子翔 HU Zixiang 1 2 王梅 WANG Mei 1 2 王昭漫 WANG Zhaoman 3 王凌志 WANG Lingzhi 3 中国电子科技集团公司第三十八研究所 中国电子科技集团公司第三十八研究所 No.38 Research Institute of CETC No.38 Research Institute of CETC 国家级工业设计中心(中电38所) 国家级工业设计中心(中电38所) National Industrial Design Center (CETC 38) National Industrial Design Center (CETC 38) 华中科技大学材料成形与模具技术国家重点实验室 华中科技大学材料成形与模具技术国家重点实验室 State Key Laboratory of Material Processing and Die & Mould Technology,Huazhong University of Science & Technology State Key Laboratory of Material Processing and Die & Mould Technology,Huazhong University of Science & Technology 为探究钎焊接头中残余应力分布问题,选用Au80Sn20/Sn63Pb37两种共晶钎料分别钎焊6061铝合金/4J34可伐合金基板,形成钎焊接头进行试验。选取不同的钎焊工艺参数(钎焊温度、钎焊时间等),以研究钎焊工艺对钎缝残余应力分布的影响规律,并进一步对残余应力进行数值模拟和研究。结果表明,残余应力均为拉应力,且靠近可伐合金侧钎缝的残余应力更高,钎焊接头在可伐合金侧钎缝更容易出现断裂;对于Au80Sn20钎料,在相同钎焊温度下,随着钎焊时间的增加,铝合金侧钎缝处的残余应力会略有增大;对于Sn63Pb37钎料,不同的钎焊温度和钎焊时间对数值结果影响不大。X射线残余应力实测结果与计算值的一致性良好,证明了模拟计算结果的正确性,为研究电子产品中轻质合金钎焊接头的可靠性提供了一种有效方法。 To explore the residual stress distribution in soldering,the procedure and simulation of Au80Sn20/Sn63Pb37 solders in soldering 6061 aluminum alloy/4J34 Kovar alloy substrate are studied in this paper. The influence of the soldering procedure on the residual stress of the soldered joints is studied,and the soldering parameters are optimized by simulation and experimental study of residual stress. The results show that the residual stress near the Kovar side soldering seam is higher,and the soldered joint is more prone to fracture on the Kovar side.For Au80Sn20 solder,at the same soldering temperature,the residual stress at the aluminum alloy soldering seam increases slightly with the increase of the soldering time. For Sn63Pb37 solder,different soldering temperatures and soldering times have little effect on the numerical results. The measured results of X-ray residual stress are in good agreement with the calculated values,which proves the correctness of the simulation results,and provides an effective method for studying the reliability of lightweight alloy soldered joints in electronic products. 钎焊 6061铝合金 4J34可伐合金 残余应力 数值模拟 soldering 6061 aluminum alloy 4J34 Kovar alloy residual stress numerical simulation TG404 国防基础科研项目(JCKY2016210B002) 2022-03-08 1 50