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Eude de la transformation de phases [beta - alpha] induite sous contrainte dans l'alliage de titane [beta]-Cez

Abstract : This work is devoted to the study of the [alpha] phase texture formation in [beta]-Cez alloy. The [alpha] phase is inherited by martensitic phase transformation induced by stress from a part of the [beta] matrix. We were particularly interested in variant selection occuring during the phase transformation. To this purpose, different mechanical tests were carried out on [beta]-Cez sheets : uniaxiale tensile tests and rolling, in rolling and transverse direction. The [beta] phase textures before and after deformation and orthorhombic [alpha] phase textures were determined by X-ray diffraction. By comparing experimental [beta] phase textures at different levels of deformation and the corresponding deformation textures simulated by a Taylor model, we showed the important role of the [beta - alpha] transformation in the accommodation of total deformation. The simulations of [alpha] phase textures using a model of phase transformation without variant selection allowed us to conclude that the [beta - alpha] phase transformation occurs with strong variant selection depending on the imposed modes of deformation. A new model including the variant selection was deloped. The best selection assumption that allows us to predict the general trends of transformation textures is such that the selected variants are those for which the strain energy due to the external stress was higher than a given threshold evaluated in this study
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Submitted on : Tuesday, April 24, 2018 - 3:47:05 PM
Last modification on : Wednesday, October 5, 2022 - 5:57:01 PM
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  • HAL Id : tel-01775915, version 1



Delphine Pionnier. Eude de la transformation de phases [beta - alpha] induite sous contrainte dans l'alliage de titane [beta]-Cez. Matière Condensée [cond-mat]. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ048S⟩. ⟨tel-01775915⟩



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