Propriétés mécaniques des verres métalliques. Mise en forme et applications

Abstract : This thesis features the two modes of deformation of metallic glasses produced under different forms (bulk, ribbons and particles). Inhomogeneous deformation in bulk samples is studied by scanning electron microscopy. Heat generated by elastic energy release during deformation is responsible for the melting observed in shear bands, and calculations using an analytical model of the temperature profile around a band are consistent with morphological observations and reports of appearance of nano-crystals in or next to deformed areas. Shaping by annealing glassy ribbons was carried out. The study presents successful shaping without embrittlement of ribbons of different metal-metal and metal-metalloid compositions of glassy systems. A heat treatment process is suggested for redistribution of applied stresses before the intervention of thermal embrittlement. A joint patent for exploiting the findings has been filed with a major producer of mechanical watches. Development of new strong and light composite materials by dispersing glassy particles in aluminum and magnesium based matrices is presented and significant improvement in mechanical properties is obtained.
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Autre. Université Grenoble Alpes, 2011. Français. <NNT : 2011GRENI001>
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Submitted on : Monday, February 7, 2011 - 10:16:21 PM
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Moustafa Aljerf. Propriétés mécaniques des verres métalliques. Mise en forme et applications. Autre. Université Grenoble Alpes, 2011. Français. <NNT : 2011GRENI001>. <tel-00564062>




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