Effect of adding Nb foil on joint properties of laser fusion welding for TC4 titanium and 7075 aluminum alloy

作     者：Jiafu ZHOU Dianwu ZHOU Huiming LI Jiafu ZHOU;Dianwu ZHOU;Huiming LI

作者机构：State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2023年第36卷第5期

页      面：508-521页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Natural Science Foundation of China(No.52174360) the Natural Science Foundation of Hunan Province of China(No.2020JJ4207) 

主　　题：Aluminum alloys Intermetallic compounds Laser lap fusion welding Mechanical property Nb foil Titanium alloys 

摘      要：It is difficult to gain effective Ti-Al fusion welding joints due to their differences in thermal properties and the appearance of brittle Ti-Al Intermetallic Compounds(IMCs).The experiments of laser fusion welding for TC4 titanium and 7075 aluminum alloy were carried out,temperature field and ductility/brittleness,as well as chemical potential of elements,were calculated,and the effect of adding Nb foil on mechanical properties of the weld was also *** results suggested that Nb atoms tend to diffuse toward Al side,which is conducive to the participation of Nb in the metallurgical reaction and contributes to forming the Ti-Nb-Al IMC layer at the *** the thickness of Nb foil increases,the tensile-shear force of joint climbs first but then declines,and reaches the highest value of 1663 N with 0.10 mm-thickness Nb foil,representing 58.38%enhancement compared with the non-added *** Nb foil slows down the heat transfer as a blocker,and thus both the melting amount of Al and the mixing area of Ti and Al *** addition,Nb alloying reduces the brittleness of the Ti-Al ***,the joint properties of titanium/aluminum are improved with the addition of Nb foil.