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Etude du comportement à hautes températures d'un alliage TiAl performant densifié par frittage flash

Abstract : One of the major challenges of the aircraft industries is to develop more effective and lighter systems. This will fits, among others, in a process of reducing fuel consumption by airplanes. Titane aluminum based alloys present a remarkable creep resistance and a high level of resistance to oxidation and low density. These properties are conductive to industrial manufacturing parts, as low pressure turbine for aircraft engines and turbocharger wheels for automotive engines. IRIS alloy (Ti49.92-Al48-W2-B0.08) has been developed by a CEMES team in 2013 in order to meet these industrial expectations. It is processed by Spark Plasma Sintering, a powder metallurgy technique which allows a fast processing with parts near to the final dimensions and a precise control of the microstructure. First tensile and creep tests on IRIS show interesting results which lead us in this work to explore more mechanical properties at a considerable service temperature of 800°C, which is considered as the ultimate operating temperature of TiAl alloys. For this purpose, we explored a new chapter in IRIS' life: the low cycle fatigue behavior. These studies have been supplemented by tensile and creep tests at the same level of temperature. In order to understand and explain these mechanical behaviors, plasticity studies have been performed on each type of solicitation. Finally, we achieve a final study on aged microstructures, to complete our understanding of the impact of the temperature on the alloy.
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  • HAL Id : tel-02492146, version 1

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Soumaya Naanani. Etude du comportement à hautes températures d'un alliage TiAl performant densifié par frittage flash. Matériaux. Université Paul Sabatier - Toulouse III, 2018. Français. ⟨NNT : 2018TOU30359⟩. ⟨tel-02492146⟩

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