FeCuNiTiAl高熵合金中间层连接铝/钛异种金属电阻点焊接头的组织与力学性能  

Microstructure and Mechanical Properties of Al/Ti Dissimilar Metal Resistance Spot Welded Joint with FeCuNiTiAl High Entropy Alloy Interlayer

作　　者：乔宇[1] 曹睿[1] 南灏 闫英杰[1] QIAO Yu;CAO Rui;NAN Hao;YAN Yingjie(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050;Advanced Technology&Materials Co.,Ltd.,China Iron&Steel Research Institute Group,Beijing 100081)

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,兰州730050 [2]中国钢研科技集团有限公司安泰科技股份有限公司,北京100081

出　　处：《机械工程学报》2024年第22期94-105,共12页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52175325);甘肃省科技重大专项(22ZD6GA008)资助项目。

摘　　要：采用电阻点焊焊接方法对表面预先激光熔覆FeCuNiTiAl高熵合金(High-entropy alloy,HEA)的TC4钛合金板与6061铝合金板进行搭接试验,研究焊接电流和焊接时间对焊接接头界面组织和力学性能的影响。结果表明,试验所采用的FeCuNiTiAl HEA在TC4钛合金板表面的润湿性良好,焊后接头界面处未产生Ti-Al金属间化合物。随着焊接电流和焊接时间的增加,熔核直径增大,但受铝板减薄量的影响,接头的抗拉剪载荷呈先上升后降低的趋势。当焊接电流为3.0 kA,焊接时间为1.0 s时,接头抗拉剪载荷达到峰值,可达4.1 kN。与Ti/Al接头相比,添加FeCuNiTiAl HEA后接头抗拉剪性能提高19.07%。焊接接头断裂方式包括三种形式:铝/HEA界面处剪切撕裂断裂、焊点周围以“纽扣”状断裂和焊点边缘沿母材断裂。大部分接头断裂于铝母材一侧,说明以FeCuNiTiAlHEA为中间层的6061铝合金与TC4钛合金的点焊接头焊接质量良好。The TC4 titanium alloy plate with pre-laser cladding FeCuNiTiAl high-entropy alloy(HEA)and 6061aluminum alloy plate were lapped by resistance spot welding.The effects of welding current and welding time on the interface microstructure and mechanical properties of welded joints were investigated.The results show that the FeCuNiTiAl high-entropy alloy used in the experiment has good wettability on the surface of TC4 titanium alloy plate,and no Ti-Al intermetallic compound is produced at the interface of the joint after welding.With the increase of welding current and welding time,the nugget diameter increases,but the tensile shear load of the joint increases first and then decreases due to the influence of the thinning amount of the aluminum plate.When the welding current is 3.0 kA and the welding time is 1.0 s,the tensile shear load of the joint reaches a peak value of 4.1 kN.Compared with the Ti/Al joint,the tensile shear performance of the joint with FeCuNiTiAl HEA is improved by 19.07%.The fracture modes of the welded joint include three types:shear tearing fracture at the aluminum/HEA interface,“button”type fracture around the weld joint and fracture along the edge of the weld joint along the base metal.Most of the joints are fractured on the side of the aluminum base metal,indicating that the spot welding lap joint of 6061 aluminum alloy and TC4 titanium alloy with FeCuNiTiAl HEA as the intermediate layer has good welding quality.

关 键 词：铝/钛焊接接头 电阻点焊 高熵合金 界面组织 力学性能 

分 类 号：TG438[金属学及工艺—焊接] TG457