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Apport de la diffraction des rayons X à haute énergie sur les transformations de phases, application aux alliages de titanes

Abstract : The high energy X-rays diffraction is a powerful tool to characterize the phase transformation in metallic materials. Its use in the case of titanium alloys has allowed to study the phase transformation during heat treatments. We were able to characterize the different phases involved, to determine in situ the evolution of the mass fraction and the cell parameters of each phase. In the first time, we have studied the phase transformation a + ß -> ß during heating of Ti17, Ti64 and Ti6242 titanium alloys. The cell parameters evolutions have been compared to the chemical composition variations (determined by Thermocalc). Then, the transformation kinetics have been compared to calculated results obtained by a phase field approach. For the Ti17 alloy, we have characterized the phase transformation ß -> a + ß during the cooling. Different conditions were used: the anisothermal condition (during continuous cooling) and the isothermal condition (during dwells at different temperatures). The influence of the thermal path have been considered by means of tempering from a [bêta]-metastable state at room temperature. The evolution of the phase fraction has been compared to kinetics measured by electrical resistivity. The cell parameter and full width at half maximum (FWHM) variations and of each phase have allowed to highlight the changes of the chemical composition and the elastic strain during phase transformation
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Fabien Bruneseaux. Apport de la diffraction des rayons X à haute énergie sur les transformations de phases, application aux alliages de titanes. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL019N⟩. ⟨tel-01748686⟩

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