Contribution à l'étude de la solidification et à la description thermodynamique des équilibres de phases du système quaternaire Fe-Al-Ti-Zr

Abstract : The first part of this work deals with the study of the microstructures and micro-segregations phenomena, inherited from the solidification on Fe-Al-Ti, Fe-Al-Zr and Fe-Al-Ti-Zr alloys. To improve our understanding of the phenomena occurring during the solidification process and to dispose of a predictive tool of the phases formed during the solidification process, a thermodynamic modeling of the iron rich corner of the Fe-Al-Ti-Zr quaternary system is proposed on a second part. From the data available in this work and in the literature, a thermodynamic modeling of each of the constituting ternaries systems is performed. Fe-Al-Zr and Fe-Ti-Zr ternaries systems were fully modeled using the ThermoCalc software. The Fe-Al-Ti ternary system is only partially modeled. These results allowed us to propose a first description of the iron rich corner of the Fe-Al-Ti-Zr quaternary system. Solidification sequences were calculated from this thermodynamic model for Fe-Al-Zr ternaries and Fe-Al-Ti-Zr quaternaries alloys and compared to our experimental results
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Vincent Rigaud. Contribution à l'étude de la solidification et à la description thermodynamique des équilibres de phases du système quaternaire Fe-Al-Ti-Zr. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL033N⟩. ⟨tel-01748889⟩

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