The aim of this study was the characterization of brazed joints using Ti-6Al-4V as base metal and Ti-20Zr-20Ni-20Cu as filler metal to propose the brazing process of these two materials for future aeronautics applications.
The research first concentrated on surface preparation, as the high reactivity of titanium makes this metal very sensitive to contamination and requires taking specific precautions. Tests at 870°C, 875°C and 900°C for 5 to 80 minutes were conducted in order to determine the best combination of time and temperature. The main goal was to obtain a lamellar microstructure throughout the brazed joint. Optic microscope and SEM observations have made it possible to characterize the different layers in the joint and to follow the evolution of their thickness with increasing brazing time. Chemical composition analyses were used to identify and highlight the homogenization of the different layers. This homogenization was also observed with microhardness tests where very low differences were measured in samples exposed to a long brazing time. In contrast, low brazing time resulted in very high microhardness values which imply the presence of brittle compounds fragilizing the brazed joint. The proposed procedure covers all the brazing process and could be used as the starting point for the mechanical tests.
| Date | 8 Jan 2015 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Philippe Bocher (Supervisor) & Mohammad Jahazi (Co-supervisor) |
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Chabrol, R. (Author),
Bocher (Supervisor) &
Jahazi (Co-supervisor),
8 Jan 2015Student thesis: Master's thesis › Master in Engineering: Mechanical Engineering