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Plasticité cristalline des matériaux hexagonaux sous cisaillement : application au magnésium

Abstract : The properties of materials with hexagonal crystalline structure are currently of interest for technical applications and for academic research. This work is articulated around the case of magnesium used in particular in aeronautics for its lightness. However, because of the restricted number of symmetries of the hexagonal crystal structure, these materials can present certain ?difficulties? of forming. Forming usually imposes large deformations on the material; this is why it is of primary importance to know its behavior. Large plastic deformations imply the development of a plastic anisotropy which can be particularly strong in hexagonal polycrystals. This work initially shows the bases of comprehension and a review of literature on the plasticity of hexagonal materials. Then the role of strain?rate sensitivity in the crystal plasticity of materials with hexagonal structures is discussed. The ideal orientations of texture and their characteristics of persistence of hexagonal closed?packed crystals in simple shearing are identified. Then an analysis of texture evolution in magnesium during equal angular extrusion is carried out. The texture and mechanical behavior of magnesium during free end torsion are also analyzed. Finally, a modeling of the deformation during equal channel angular extrusion by a general flow function is proposed
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Submitted on : Thursday, March 29, 2018 - 2:00:37 PM
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  • HAL Id : tel-01752866, version 1



Benoît Beausir. Plasticité cristalline des matériaux hexagonaux sous cisaillement : application au magnésium. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ042S⟩. ⟨tel-01752866⟩



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