Evolution microstructurale d'un alliage à base TiAl : sollicitation mécanique par compression dynamique et stabilité thermique

Abstract : The aim of this thesis is the study of the microstructural evolution of a ?-TiAl alloy during dynamic compression tests between 196 and 600°C and isothermal heat treatments at 700 and 900°C for various times, between 3 and 18 days. The alloy with a nominal composition of Ti-46.5Al-4(Cr, Nb, Ta, B) (at. %) and a near lamellar microstructure presents a good combination of mechanical strength and ductility. The alloy is compound of three ordered phases: alpha-Ti3Al, gamma-TiAl and B2-TiAl. A study of the crystal structure of the B2, gamma and alpha2 phases, of their the orientation relationships and of the coincidence site lattices and the displacement shift complete lattices has been performed by convergent beam electron diffraction (CBED, Tanaka Multibeam Method and Microdiffraction)
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Sandrine Amélio. Evolution microstructurale d'un alliage à base TiAl : sollicitation mécanique par compression dynamique et stabilité thermique. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL067N⟩. ⟨tel-01752531⟩

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