焊后时效处理对Al-Zn-Mg-Cu合金焊接接头组织和性能的影响  

Effect of post weld aging treatment on microstructure and properties of Al-Zn-Mg-Cu alloy welded joint

作　　者：赵娟刚 刘志义[2] 柏松[2] ZHAO Juan-gang;LIU Zhi-yi;BAI Song(School of Materials Science and Engineering,Hunan Institute of Technology,Hengyang 421200,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]湖南工学院材料科学与工程学院,湖南衡阳421200 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料热处理学报》2022年第12期161-168,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51171209);国家重点研究与发展计划项目(2016YFB0300900)。

摘　　要：采用拉伸试验、扫描电镜和透射电镜等研究了焊后时效处理对Al-Zn-Mg-Cu合金焊接接头的微观组织和性能的影响。结果表明:Al-Zn-Mg-Cu合金电子束焊接接头的熔化区中分布着快速凝固组织,熔化区的硬度和强度是整个焊接接头中最低的。对焊接接头进行T6时效处理,焊接接头的抗拉强度从445 MPa提高至511 MPa,但仍然低于母材的强度。对焊接接头和母材在不同温度下进行高温拉伸测试,结果表明焊接接头和母材的高温拉伸性能均随着拉伸温度的升高而降低。Effect of post weld aging treatment on microstructure and properties of Al-Zn-Mg-Cu alloy welded joint was studied by means of tensile test, scanning electron microscopy and transmission electron microscopy. The results show that the rapid solidification microstructure is distributed in the fusion zone of the Al-Zn-Mg-Cu alloy electron beam welded joint, and the hardness and strength of the fusion zone are the lowest in the whole welded joint. After T6 aging treatment, the tensile strength of the welded joint is increased from 445 MPa to 511 MPa, but it is still lower than that of the base metal. The high-temperature tensile test results of the welded joint and the base metal at different temperatures show that the high-temperature tensile properties of the welded joint and the base metal decrease with the increase of the tensile temperature.

关 键 词：Al-Zn-M-Cu合金 焊后时效处理 GP区 η′相 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG441.8[金属学及工艺—金属材料]