Interfacial microstructure and mechanical property of Ti6Al4V/A6061 dissimilar joint by direct laser brazing without filler metal and groove

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-01, Vol.560, p.111-120
• Main Authors: Song, Zhihua, Nakata, Kazuhiro, Wu, Aiping, Liao, Jinsun
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum alloy; Aluminum base alloys; Applied sciences; Brazing. Soldering; Dissimilar joining; Exact sciences and technology; Focusing; Intermetallic compounds; Intermetallics; Joining, thermal cutting: metallurgical aspects; Laser brazing; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Offsets; Titanium alloy; Titanium aluminides; Titanium base alloys; Welding
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2012.09.044

Laser brazing of Ti6Al4V and A6061-T6 alloys with 2mm thickness was conducted by focusing laser beam on aluminum alloy side, and the effect of laser offset distance on microstructure and mechanical properties of the dissimilar butt joint was investigated. Laser offset has a great influence on the thickness of interfacial intermetallic compound (IMC) layer and the mechanical property of joint. The thickness of interfacial IMC layer is less than 500nm, and the average tensile strength of the joint reaches 64% of aluminum base material strength, when suitable welding conditions are used. The interfacial IMC is TiAl3. The formation of interfacial IMC layer and its effect on mechanical property of the joint are discussed in the present study.