Elaboration et caractérisation physico-chimique d’alliages composites à base d’Aluminium et de Magnésium par multi-colaminage et recuits

The main objective of this thesis was to deepen the study of various metallurgical and physico-chemical properties of aluminum and magnesium-based alloys, specifically hyperdeformed laminated composites through the ARB technique. This investigation involved the use of scanning electron microscopy (SEM) in conjunction with EDX and EBSD, X-ray diffraction under synchrotron radiation (SXRD), nano-indentation tests, as well as electrochemical tests. Special attention was given to the in-depth analysis of the role of intermetallic compounds formed at the interfaces. EBSD and SXRD analyses highlighted the formation of polycrystalline intermetallic compounds after 2 ARB cycles, with columnar and normal growth at the interface. The Mg17Al12 and Al3Mg2 intermetallic compounds were characterized by a random texture. It was demonstrated that the corrosion rate was closely related to the ARB deformation level, and the AZ31 layers appeared to exert a predominant influence on the corrosion process