Effect of microstructure and precipitation phenomena on theMechanical behaviour of AA6061-T6 aluminum alloy weld.

Auteurs :  M.HAKEM, S. Lebaili, S. Mathieu, D. Miroud, A. LEBAILI, B. Cheniti
Année : 2019
Domaine : Sciences des matériaux
Type : Communication
Conférence: THE 72 nd IIW ANNUAL ASSEMBLY AND INTERNATIONAL CONFERENCE
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés : Aluminum alloys, TIG welding, precipitates, microstructure

Résumé : 

In the present study, the effect of microstructure and precipitation phenomenaon the micro hardness of Tungsten Inert Gas (TIG) welded AA6061-T6 aluminum alloyare investigated. The microstructure features showed mainly the grains of aluminum solid solution with the presence of some precipitates at the grain boundaries. Scanning electron microscope micrographs exhibited the presence of Fe-based intermetallic and B-equilibrium precipitates throughout a-Al grains. In the heat-affected zone (HAZ), the dissolution, over-aged and coalescence of precipitates are observed; their hardening effects disappear and a decrease in strength and hardness are noticed.