铝锂合金瞬间液相扩散连接接头的性能  

Properties of transient liquid phase diffusion bonding joint of Al-Li alloy

作　　者：刘罗林 黄本生[1,2] 李天宁 何子涛 郑建能 LIU Luo-lin;HUANG Ben-sheng;LI Tian-ning;HE Zi-tao;ZHENG Jian-neng(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Energy Equipment Institute,Southwest Petroleum University,Chengdu 610500,China;Erzhong(Deyang)Heavy Equipment Co Ltd,Deyang 618099,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]西南石油大学能源装备研究院,四川成都610500 [3]二重(德阳)重型装备有限公司,四川德阳618099

出　　处：《材料热处理学报》2023年第1期172-180,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51704255)。

摘　　要：采用纯Zn箔作中间层,对2195铝锂合金进行瞬间液相扩散焊(TLP),采用光学显微镜、扫描电镜、X射线衍射、显微硬度计和万能试验机等研究了焊接温度对接头的显微组织、元素扩散、物相以及力学性能的影响。结果表明:随着焊接温度的升高,接头焊缝处元素扩散更充分,组织更均匀,但焊接温度过高时,焊缝处会出现母材过烧和晶粒粗大的现象;接头焊缝处物相主要由Al、Al_(0.71)Zn_(0.29)和CuZn_(2)金属间化合物组成;随着焊接温度的升高,接头显微硬度总体呈下降趋势,剪切强度呈先上升后下降的趋势,当焊接温度为560℃时,接头剪切强度最大,为96.7 MPa。The transient liquid phase diffusion welding(TLP)of 2195 Al-Li alloy was carried out with pure Zn foil as the intermediate layer.The effects of welding temperature on microstructure,element diffusion,phase and mechanical properties of the joint were studied by means of optical microscope,scanning electron microscopy,X-ray diffraction,microhardness tester and universal testing machine.The results show that with the increase of welding temperature,the element diffusion at the weld of the joint is more sufficient and the microstructure is more uniform.However,when the welding temperature is too high,the phenomenon of base metal overburning and coarse grain will appear at the weld.The phase at the weld of the joint is mainly composed of Al,Al_(0.71)Zn_(0.29) and CuZn_(2) intermetallic compounds.With the increase of welding temperature,the microhardness of the joint generally decreases,and the shear strength increases first and then decreases.When the welding temperature is 560℃,the shear strength of the joint is the maximum,which is 96.7 MPa.

关 键 词：铝锂合金 瞬间液相扩散焊 纯Zn箔 显微组织 力学性能 

分 类 号：TG456.9[金属学及工艺—焊接]