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Comportement mécanique des verres métalliques massifs - Effet d'une cristallisation partielle

Abstract : Interest in the mechanical behavior of metallic glasses, materials with no long range order, has picked up recently due to the development of alloys that are « amorphisable » at low quenching rates. These new alloys are now able to be prepared as bulk specimens of cm size. The deformation of a Zr based bulk metallic glass was study in a large range of temperature and loading routes. At room temperature the mechanical behaviour is macroscopically brittle while, at temperature above the glass transition, a large deformation ability is observed. Original characterization techniques using both compression tests and nanoindentation tests (at room temperature) or compression tests and Dynamic Mechanical Analysis (above the glass transition temperature) were used and validated. These materials allow as well, thanks to a partial crystallization of the samples, the fabrication of nanocomposites amorphous / crystal. The crystallization process was carefully studied and original methods of meausurement of the crystalline volume fraction were developped. The mechanical behavior of those materials was studied at both room temperature and high temperature ranges using the methods validated on amorphous samples. The presence of nanocrystallites induces limited changes at room temperature while important modifications are measured at high temperatures.
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Contributor : Sébastien Gravier <>
Submitted on : Monday, January 15, 2007 - 4:27:33 PM
Last modification on : Friday, November 6, 2020 - 4:39:22 AM
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  • HAL Id : tel-00124650, version 1

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Sébastien Gravier. Comportement mécanique des verres métalliques massifs - Effet d'une cristallisation partielle. Mécanique [physics.med-ph]. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00124650⟩

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