VALIDATION PAR DIFFRACTION DES RAYONS X D'UN MODELE MULTI ECHELLE DE TRANSFORMATION DE PHASE DES ALLIAGES A MEMOIRE DE FORME

Abstract : Shape memory alloys are targets for a variety of applications in areas such as aerospace , automotive, biomedical, and even the clothing industry. Indeed, they combine two interesting properties, made possible by the coexistence in their microstructure of aus-tenite (high temperature stable phase) and martensite (low temperature stable phase) : the shape memory effect (i.e. ability to recover their initial shape by simple heating) and super elasticity (i.e. ability to return to a zero strain state after large deformation-up to 8 %). In this paper, in situ X-Ray Diffraction (XRD) measurements are performed during tensile tests and heating-cooling cycles in order to make a quantitative measurement of the phases fractions. Results are used as a basis for comparative validation of a multi-scale model developed in LMT-Cachan, having the phase variants fractions as internal variables.
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Mame Fall, Karine Lavernhe-Taillard, Olivier Hubert. VALIDATION PAR DIFFRACTION DES RAYONS X D'UN MODELE MULTI ECHELLE DE TRANSFORMATION DE PHASE DES ALLIAGES A MEMOIRE DE FORME. Congrès Français de Mécanique 2015 (CFM 2015), AFM, Aug 2015, Lyon, France. ⟨hal-01552408⟩

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