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Generation and characterization of T40/A5754 interfaces with lasers

Article dans une revue avec comité de lecture
Author
PEYRE, Patrice
BERTHE, Laurent
POUZET, Sébastien
SALLAMAND, Pierre
103192 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
TOMASHCHUK, Iryna
103192 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
ccDAL, Morgan
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/9752
DOI
10.1016/j.jmatprotec.2014.04.019
Date
2014
Journal
Journal of Materials Processing Technology

Abstract

Laser-induced reactive wetting and brazing of T40 titanium with A5754 aluminum alloy with 1.5 mm thickness was carried out in lap-joint configuration, with or without the use of Al5Si filler wire. A 2.4 mm diameter laser spot was positioned on the aluminum side to provoke spreading and wetting of the lower titanium sheet, with relatively low scanning speeds (0.1 to 0.6 m/min). Process conditions did not play a very significant role on mechanical strengths, which were shown to reach 250-300 N/mm on a large range of laser power and scanning speeds. In all cases considered, the fracture during tensile testing occurred next to the TiAl3 interface, but in the aluminum fusion zone. In a second step, we have investigated the interfacial resistance with the LASAT bond strength tester, based upon the generation and propagation of laser-induced shock waves. This allowed us estimating a uniaxial bond strength of 0.68 GPa for the T40/A5754 interface under dynamic loading conditions.

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