Relations microstructure-propriétés à haute température dans les alliages d'aluminium pour application aéronautique

Abstract : Aluminum alloys possess low weight and cost and have a high strength which makes them one of the most used materials in aircraft industry. Their operating temperature is included in the range of – 55 to + 85~°C. Nevertheless, the literature data are lacking for aluminum alloys exposed at temperature significantly higher than 85~°C.The aim of this study is to characterize the microstructural and mechanical properties evolution of aluminum alloys as a function of the time, temperature and load after different times of exposure at temperatures above 85 °C.2024 T3 and T8 and 5086 H111 alumnium alloys were artificially aged at different temperatures in the range of 85 to 250~°C for different durations, comparable to service time, varying from 1 to 10~000~h. Then, the mechanical properties were investigated in regard of the microstructural evolutions.Finally, a microstrure/properties map was obtained in a wide range of temperatures and for short and long durations of aging. Non destructive tests were also carried out in order to detect parts exposed in temperature and assess to their remanent properties.
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Louise Briez. Relations microstructure-propriétés à haute température dans les alliages d'aluminium pour application aéronautique. Matériaux. PSL Research University, 2018. Français. ⟨NNT : 2018PSLEM045⟩. ⟨tel-02142413⟩

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