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FRICTION STIR WELDING OF ALUMINIUM ALLOYS

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Moussa ATHMANI, , «FRICTION STIR WELDING OF ALUMINIUM ALLOYS», Thèse de doctorat, Université Ferhat Abbas - Sétif 1

FRICTION STIR WELDING OF ALUMINIUM ALLOYS

Moussa ATHMANI

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(Thèse en préparation)

Abstract: Friction stir Welding (FSW) is a process of assembly in a solid state. Developed sinceten years, it makes it possible to be freed from the intrinsic defects obtained by traditionalwelding processes in liquid phase. However the mechanisms of formation of the welds jointsby friction stir remain relatively ignored because of the complexity of the phenomena broughtinto play, on the one hand the space variation of the deformation states and temperature, andon the other hand, nature and the thermal and mechanic behaviors of materials and the toolused.In this context, the study suggested will aim to choose a grade of a well-definedaluminum alloy, then to carry out operations of welding with various parameters. Withthrough this study, the microstructures of welded joints will be finely characterized by opticalmicroscopy, DSC, TEM, SEM and EBSD. In order to highlight the interactions between thedeformations, the precipitation and the recrystallization occurring during the welding state.And to establish the link between the microstructure and the mechanical properties of thejoints will be mechanically tested: microhardness; tensile test and the fatigue test.

Keywords : Friction Stir Welding, deformation, Temperature, microstructure, TEM

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