Développement de nouveaux alliages biocompatibles instables mécaniquement à bas module d'Young

Abstract : Biocompatible metastable β-titanium alloys have attracted much attention for biomedical applications in recent years thanks to their superelastic and/or shape memory behavior, their superior corrosion resistance and their excellent cold workability. In this present study, a superelastic Ti-26Nb alloy and a shape memory Ti-24Nb alloy were produced by the cold crucible levitation melting method. A detailed microstructural and mechanical characterization were performed. The deformation mechanisms occurring during uniaxial deformation were identified for these two alloys by coupling in situ tensile testing with X-ray diffraction measurement. An optimization route based on nanostructuring process was developed in order to enhance both strength and superelasticity while keeping a low elastic modulus. These properties are required to improve the load transfer along the bone/implant interface which is essential to the success of implants. The microstructural evolution during the thermomechanical process resulting in the optimization of properties was investigated through tensile tests, X-ray diffraction and transmission electron microcopy. The last part of this study deals with an introduction of micromechanical modeling of the Ti-26Nb behavior. The crystallographic features of the martensitic transformation were determined by applying the Ball and James theory. The influence of the crystallographic orientation on the mechanical response was investigated for tension and compression.
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Submitted on : Friday, December 6, 2013 - 4:22:09 PM
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Wafa Elmay. Développement de nouveaux alliages biocompatibles instables mécaniquement à bas module d'Young. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0007⟩. ⟨pastel-00915166⟩

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