Choix des Matériaux et des procédés de mise en forme pour l’allègement des boîtiers d’électronique de puissance des véhicules électriques

Abstract : To make electric vehicles more attractive, researches to increase the autonomy of electric vehicles are underway on the battery technology and on the lightening of many vehicle parts. For the second approach, one way is to replace aluminum by magnesium without loosing mechanical and corrosion resistance performance. The AZ91 commercial alloy was modified with additional elements to meet the mechanical requirements for the power electronic casings. Sand casting samples were studied for the comparison of microstructure and properties. First, metallographic observations were performed with an optical microscope and a SEM combined with microanalysis (epma) coupled with quantitative image analysis, then the solidification sequence was analysed using thermal analysis in order to identify the changes in microstructure when alloying. Combined with DTA, X-ray diffraction and micro probe analysis, these techniques are useful to understand the solidification sequence of the complex alloys and their response to heat treatments. Tensile and hardness tests were then performed in order to quantify the mechanical strength of the different samples. Fractographic observations were also done to characterize the rupture of the specimens. AZ91D is known for its good corrosion resistance. Corrosion behaviour of modified alloys was assessed by electrochemical and non-electrochemical methods.
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Delphine Thielleux. Choix des Matériaux et des procédés de mise en forme pour l’allègement des boîtiers d’électronique de puissance des véhicules électriques. Matériaux. Ecole Nationale Supérieure des Mines de Paris, 2014. Français. ⟨NNT : 2014ENMP0094⟩. ⟨tel-01685023⟩

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