[Entropie des verres métalliques et effet de taille sur la transition vitreuse]
Une description statistique des verres métalliques est proposée, basée sur l’évaluation d’une entropie et utilisant le concept de paysage du potentiel énergétique (PEL). Le PEL est sondé en utilisant la nano-indentation, en supposant que les serrations observées sont liées aux niveaux d’énergie locaux. La taille des serrations suit une distribution de Poisson cohérente avec la dynamique des événements rares. Une entropie est dérivée révélant des paramètres caractérisant la structure du verre. La pertinence de l’approche est testée sur l’effet de taille sur les propriétés mécaniques du verre métallique. On constate que les relations expliquent l’effet de l’épaisseur du film sur la température de transition vitreuse observée pour les polymères vitreux.
A statistical description of metallic glasses is proposed based on evaluation of an entropy and using the concept of potential energy landscape (PEL). The PEL is probed using nano-indentation, assuming that serrations observed are related to local energy levels. Serrations sizes follow a Poisson distribution consistent with, that their formation is a rare events. An entropy is derived revealing parameters characterizing the glass structure. The relevance of the approach is tested on the size effect on mechanical properties of metallic glass. It is noticed that the relations explain the effect of film thickness on the glass transition temperature observed for glass polymers.
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Mot clés : Verre métallique, Entropie, Nano-indentation, Comportement mécanique, Transition vitreuse
Yannick Champion 1
CC-BY 4.0
@article{CRPHYS_2023__24_S1_155_0,
author = {Yannick Champion},
title = {Entropy of metallic glasses and the size effect on glass transition},
journal = {Comptes Rendus. Physique},
pages = {155--164},
publisher = {Acad\'emie des sciences, Paris},
volume = {24},
number = {S1},
year = {2023},
doi = {10.5802/crphys.130},
language = {en},
}
Yannick Champion. Entropy of metallic glasses and the size effect on glass transition. Comptes Rendus. Physique, Volume 24 (2023) no. S1, pp. 155-164. doi : 10.5802/crphys.130. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.130/
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