Assemblage des alliages de magnésium laminés à chaud par soudage friction malaxage et soudage laser : approche expérimentale vers une compréhension des propriétés mécaniques

Abstract : The challenges of weight reduction in aerospace industry have drawn considerable interest in magnesium alloys technologies. Assessing the efficiency of new joining techniques, such as Laser Beam Welding and Friction Stir Welding is then required. The aim of this study is to investigate the relationship between welding parameters and the resulting microstructure and mechanical properties. It was part of the AEROMAG European Project whose objective was the use of wrought Magnesium alloys in aeronautics. Friction Stir Welds and Laser Beam (Nd:YAG and CO2) Welds were processed using 2 mm thick hot rolled plates of AZ31, AZ61 and WE43 Magnesium alloys. The process window for LBW and FSW was determined. The weld characterisation was focused on AZ31 alloy. A relationship between welding parameters, the temperatures undergone and the weld microstructure was established for each process. FSW induced microstructural changes and complex residual stress distribution, which have a primary influence in FSW mechanical properties. The influence of texture evolution and precipitation evolution on LBW mechanical properties was also determined. Localisation features similar to shear bands were observed in both LBW and FSW. FSW resulted in a dramatic loss in mechanical properties, which could not be recovered after heat treatments, whereas LBW presented after heat treatment mechanical properties similar to those of the base metal. A comparison was made with precipitation hardenened alloys (AZ61 and WE43) mechanical properties. Finally, the potentiality of replacing aluminium alloys with these magnesium alloys was studied.
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Submitted on : Friday, December 5, 2008 - 8:00:00 AM
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Loreleï Commin. Assemblage des alliages de magnésium laminés à chaud par soudage friction malaxage et soudage laser : approche expérimentale vers une compréhension des propriétés mécaniques. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2008. Français. ⟨NNT : 2008ENAM0025⟩. ⟨pastel-00004253⟩

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