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Dynamique de formation de la microstructure de solidification d'alliages métalliques : caractérisation par imagerie X synchrotron

Abstract : We studied in situ and real-time the directional solidification of thin samples of binary alloys and a quasicrystal using both X-ray radiography and topography techniques. On Al-3.5wt%Ni non-refined alloys, we studied the formation of the initial state and the solidification front morphology (cellular then dendritic growth). Mechanical strains were highlighted. The Columnar to Equiaxed Transition was studied on Al-3.5wt%Ni refined alloys. We described the blocking of the columnar front and the following equiaxed growth regime. The refining particles efficiency reaches a limit. An analysis of the microstructure morphology was performed. The study of the i-AlPdMn quasicrystal shows the growth of faceted dodecahedral grains. Thermosolutal convection effects were highlighted. Strain visualisation shows a strong deformation of grains. The apparition of porosity was observed during fusion of grains.
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Submitted on : Monday, March 30, 2009 - 12:04:35 PM
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Guillaume Reinhart, Henri Nguyen-Thi, Bernard Billia, Joseph Gastaldi. Dynamique de formation de la microstructure de solidification d'alliages métalliques : caractérisation par imagerie X synchrotron. Matériaux. Université Paul Cézanne - Aix-Marseille III, 2006. Français. ⟨tel-00371700⟩

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