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Relations microstructure, propriétés mécaniques et résistance à l'oxydation de la phase MAX Ti3AlC2

Abstract : The lightening of structures has become a major challenge for transport industries. New materials with, at least, equivalent specific properties to currently used materials have been designed in order to cope with this challenge. In this regard, Ti3AlC2 MAX phase has been studied. The high temperature (800-1000°C) oxidation resistance and tension and tensile creep properties were assessed for Ti3AlC2 samples elaborated using a powder metallurgy process (pressureless sintering + spark plasma sintering). The various oxidation tests pointed out two different behaviors (protective oxidation or catastrophic one depending on the grown oxides nature) mainly controlled by samples microstructural features (grains size, elements on A site, roughness and porosity). The first tensile creep tests ever performed on Ti3AlC2 MAX phase indicates the high ductility of these materials whose specific properties reach or surpass those of polycrystalline superalloys and titanium aluminides. A multi-scale study highlights deformation mechanisms occurring through intergranular sliding at 900 and 1000°C and through dislocations glide at 800°C. Damage mechanisms occurring through cavitation supported by crack oxidation phenomena on gauge length surface were also underlined.
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Elodie Drouelle. Relations microstructure, propriétés mécaniques et résistance à l'oxydation de la phase MAX Ti3AlC2. Matériaux. Université de Poitiers, 2017. Français. ⟨NNT : 2017POIT2277⟩. ⟨tel-01981512⟩

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