焊接温度对5A06铝合金SPS钎焊接头组织和性能的影响  

Effect of Brazing Temperature on Microstructure and Properties of Spark Plasma Brazed Joint of 5A06 Aluminum Alloy

作　　者：宋奎晶[1] 季雨凯 韦勇 丁子恒 张铭雨 刘鑫泉 钟志宏[1] 方坤[2] Song Kuijing;Ji Yukai;Wei Yong;Ding Ziheng;Zhang Mingyu;Liu Xinquan;Zhong Zhihong;Fang Kun(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;The 38th Research Institute of China Electronics Technology Corporation,Hefei 230088,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]中国电子科技集团公司第三十八研究所,安徽合肥230088

出　　处：《稀有金属材料与工程》2023年第10期3461-3469,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51905143);中央高校基本科研业务费专项资金;安徽省自然科学基金(2208085ME134)。

摘　　要：5A06铝合金具有中高强度、优良的耐腐蚀性以及良好的导热和机械加工性能,在雷达液冷组件和波导结构件等精密制造领域广泛应用。本研究采用Al-20Cu-5Si-2Ni钎料,通过放电等离子烧结(sparkplasmasintering,SPS)技术实现5A06铝合金SPS钎焊,研究了焊接温度对连接接头组织和性能的影响。当焊接温度为510~530℃,压力为4MPa,保温时间为10min时,接头抗拉强度随温度升高而增大,最大接头抗拉强度为152MPa,530℃焊接温度下获得的接头拉伸断口呈现韧性断裂特征,韧窝细小均匀。在低温钎料、焊接压力、脉冲电场和短时保温的综合作用下,SPS钎缝相比常规真空钎焊变窄,界面焊合率提高,晶粒细小,脆性相分散,元素扩散充分,形成的细小Mg_(2)Si和Si颗粒能够显著提升接头力学性能。5A06 aluminum alloys are widely used in the precision manufacturing parts such as liquid-cooling and waveguide components,because of their high strength,excellent corrosion resistance,as well as good thermal conductivity and machinability.In this paper,spark plasma brazing by using Al-Cu-Si-Ni solder foil was performed to realize the joining of 5A06 aluminum alloy.The influence of brazing temperature on microstructure and mechanical properties of brazed 5A06 alloy joints was investigated.The results show that at the brazing temperature of 510-530℃,pressure of 4 MPa and holding time of 10 min,the tensile strength of brazed joint increase with the temperature increasing.The maximum tensile strength is 152 MPa,wherein ductile fracture morphology mainly composed of fine and homogeneous dimples is obtained at 530℃.With the combined effect of low melting point solder,welding pressure,pulse electric field and short holding time,the brazing zone is thinner,while matrix grains are finer and brittle phases are distributed uniformly.Meanwhile,the interfacial atomic diffusion and reaction are enhanced,leading the strengthened microscopic metallurgical bonding by fine Mg_(2)Si and Si particles.

关 键 词：5A06铝合金 SPS钎焊 焊接温度 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG453.9[金属学及工艺—金属材料]