Microstructure Evolution in an Aluminum Cladded Sheet during Vacuum Brazing

Cécile Bernardi (1, 2) , Alain Hazotte (2) , Nathalie Siredey-Schwaller (2) , Thierry Mazet (1) , Jacques Lacaze (3)

1 Fives Cryo
2 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Microstructure evolution of a 3003 sheet cladded with 4004 brazing alloy is investigated during slow heating (1K/min) under secondary vacuum up to isothermal brazing temperature (590°C). Optical and scanning microscopies, EDS chemical analysis and EBSD orientation mapping are used. Experimental results are discussed in the light of thermodynamic calculations using Thermo-Calc. Comparisons show good agreement as long as Mg vaporization does not take place.

Mots clés: Heat exchangers; Brazing; Aluminum alloys; Microstructure

Domaines: Matériaux

Cécile Bernardi, Alain Hazotte, Nathalie Siredey-Schwaller, Thierry Mazet, Jacques Lacaze. Microstructure Evolution in an Aluminum Cladded Sheet during Vacuum Brazing. Materials Science Forum, 2014, 790-791, pp.355-360. ⟨10.4028/www.scientific.net/MSF.790-791.355⟩. ⟨hal-01167219⟩