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Physico-chimie des échanges matrice/renfort dans un matériau composite acier/TiC

Abstract : Steel metal matrix composites reinforced with titanium carbide particles (25 vol% ) can be industrially produced by a solid-state process including three main steps: mechanical alloying by high energy milling of steel and titanium carbide powders; consolidation of the powder mixture thus obtained by hot forging, hot extrusion or hot pressing at 1050-1250°C; heat treatment of the resulting composite material. During each of the three steps, the TiC reinforcing particles are submitted to severe mechanical shocks or stresses. Moreover, they can chemically react with impurities of the gas phase during milling or with the steel matrix during consolidation or further heat treatment. As a result, changes are likely to occur in the grain size, crystallite size, morphology and composition of the particles. The aim of this thesis was to point out and characterize these changes. For that purpose, a procedure was developed to selectively dissolve the metal matrix and extract the TiC particles from the starting powder mixture, from the consolidated composite material and from further heat-treated composite samples. The extracted TiC particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), chemical microanalysis (CMA) and X-ray diffraction (XRD). This revealed important changes indicative of the physical and chemical interaction phenomena that successively proceed during processing of the steel/TiC composite
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Submitted on : Wednesday, July 17, 2013 - 1:37:12 PM
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  • HAL Id : tel-00642978, version 2



Alice Courleux. Physico-chimie des échanges matrice/renfort dans un matériau composite acier/TiC. Autre. Université Claude Bernard - Lyon I, 2011. Français. ⟨NNT : 2011LYO10133⟩. ⟨tel-00642978v2⟩



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