Joining mechanism of Ti/Al dissimilar alloys during laser welding-brazing process
2010; Elsevier BV; Volume: 509; Issue: 3 Linguagem: Inglês
10.1016/j.jallcom.2010.09.125
ISSN1873-4669
AutoresShuhai Chen, Liqun Li, Yanbin Chen, Jihua Huang,
Tópico(s)Aluminum Alloy Microstructure Properties
ResumoJoining mechanism of Ti/Al dissimilar alloys was investigated during laser welding–brazing process with automated wire feed. The microstructures of fusion welding and brazing zones were analysed in details by transmission electron microscope (TEM). It was found that microstructures of fusion welding zone consist of α-Al grains and ternary near-eutectic structure with α-Al, Si and Mg2Si. Interfacial reaction layers of brazing joint were composed of α-Ti, nanosize granular Ti7Al5Si12 and serration-shaped TiAl3. For the first time, apparent stacking fault structure in intermetallic phase TiAl3 was found when the thickness of the reaction layer was very thin (approximately less than 1 μm). Furthermore, crystallization behavior of fusion zone and mechanism of interfacial reaction were discussed in details.
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