Microstructure and mechanical characterization of re-melted Ti-6A1-4V and Al-Mg-Si alloys butt weld

被引:35
作者
Guo, Shun [1 ]
Peng, Yong [1 ]
Cui, Chong [1 ]
Gao, Qiong [1 ]
Zhou, Qi [1 ]
Zhu, Jun [2 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China
[2] Nanjing Inst Technol, Nanjing 211100, Jiangsu, Peoples R China
关键词
Laser welding; Dissimilar metals welding; Titanium alloy; Mechanical properties; Thermodynamics; INTERFACIAL MICROSTRUCTURE; EXPERIMENTAL VALIDATION; DISSIMILAR JOINT; TITANIUM-ALLOY; FEM ANALYSIS; TI/AL JOINT; LASER; ALUMINUM; SIMULATION; TI6AL4V;
D O I
10.1016/j.vacuum.2018.04.048
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
It is becoming increasingly difficult to improve tensile strength of dissimilar metals by controlling the formation of intermetallic compounds (IMCs) in the welding of Ti and Al alloys. In this study, a novel laser welding process based on welding-brazing process is proposed, referred to as local remelting process. Metallurgical bonding of incompatible Ti-6A1-4V and Al-Mg-Si alloys was successfully achieved and sound joint with well appearance was obtained. Tensile strength of the joint reached up to 78.6% that of Al substrate, typically the strength is lower than 70%. In order to reveal the effects of local remelting process on the microstructure and tensile strength, SEM, EDS and XRD were applied for the analysis and tensile strength was tested. In addition, FEM simulation was conducted to improve the comprehension of microstructural evolution involved in the process. The results indicate that the joint realized the metallurgical bonding by direct irradiation on aluminum sheet and heat conduction formed by welding on titanium sheet promoted the joining in the interface. Original ordered phase structure was destroyed and a thinner IMCs layer was formed. Both joints present brittle fracture characteristics, but for the joint of remelting process, parts of fracture surface were featured by dimples.
引用
收藏
页码:58 / 67
页数:10
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