摘要
对添加Ni片作为中间层的AZ31B镁合金板和TC4钛合金板进行激光熔钎焊搭接试验,分析接头的力学性能、宏观形貌和微观组织。结果表明:Ni作为中间层的镁/钛激光熔钎焊接头焊缝成形良好,部分位置出现鱼鳞纹,接头焊缝区由镁侧焊缝、钛侧焊缝和界面化合物层(IMC)组成。其中,镁侧IMC层由Mg-Al-Ni相和Mg2Ni相组成,钛侧IMC层由Ti2Ni相组成。随着接头热输入量的增大,镁/钛两侧焊缝中元素得到充分扩散,并在两侧焊缝中生成金属间化合物,使得接头的力学性能大大增强。随着焊接线能量的增加,钛侧熔深一直增大,接头拉剪载荷呈现出先增大后减小的趋势。在焊接线能量Q=722.22 J·cm^(-1)时,接头拉剪载荷达到1 241.67 N。
Laser welding-brazing joint lap tests were carried out on AZ31B magnesium alloy plate and TC4 titanium alloy plate with Ni sheet as interlayer.The mechanical properties,interface macro morphology and microstructure of the joint were analyzed.The results show that the welding zone of Mg/Ti laser welding joint with Ni as intermediate layer is well formed,and scale lines appears in some positions,the weld zone consists of magnesium side weld zone,titanium side weld zone and interfacial compound layer(IMC).The IMC layer on the magnesium side zone is composed of Mg-Al-Ni phase and Mg2Ni phase,and the IMC layer on the titanium side zone is composed of Ti2Ni phase.With the increase of welding heat input of joint,the elements in both sides of the weld zone are fully diffused,and intermetallic compounds are formed in both sides of the weld zone,which greatly enhances the mechanical properties of the joint.With the increase of welding heat input,the penetration of titanium side increases all the time,and the tensile shear load of the joint first increases and then decreases.When the welding heat input Q=722.22 J·cm^(-1),the tensile shear load of the joint reached 1241.67 N.
作者
陈国财
胡德安
程东海
刘亚明
CHEN Guo-cai;HU Dean;CHENG Dong-hai;LIU Ya-ming(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,NanChang 330063,China)
出处
《南昌航空大学学报（自然科学版）》
CAS
2021年第1期63-67,108,共6页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
国家自然科学基金(51965045)。
关键词
Ni片
激光熔钎焊
元素扩散
金属间化合物
线能量
Ni sheet
laser welding-brazing
element diffusion
intermetallic compounds
welding heat input
