[Problèmes de germination dans de la métallurgie de l'état solide : des développements récents et des questions ouvertes]
Les processus de germination jouent un rôle central dans les évolutions microstructurales des métaux et alliages observées au cours des traitements thermomécaniques. Ces processus peuvent résulter de transformations de phase (comme dans le cas de la précipitation) ou d'instabilités des défauts structuraux (comme dans la recristallisation). Quoique le terme de germination soit indifféremment utilisé dans les deux cas, la situation est profondément différente. Dans le cas de la précipitation, les espèces sont conservées, et la germination résulte de fluctuations statistiques autorisant l'apparition d'un germe critique de la nouvelle phase. Dans le cas de la recristallisation, le phénomène physique sous jacent est la croissance progressive d'une structure de sous grains, jusqu'à une configuration instable permettant la croissance d'un grain libre de dislocation dans une matrice fortement disloquée. Les deux cas nécessitent des traitements théoriques de nature différente qui sont présentés dans l'article.
Nucleation processes play a key role in the microstructure evolution of metallic alloys during thermomechanical treatments. These processes can involve phase transformations (such as precipitation) and structural instabilities (such as recrystallisation). Although the word ‘nucleation’ is used in both cases, the situation is profoundly different for precipitation and for recrystallisation on which this article is focussed. In the case of precipitation, species are conserved and the underlying physics is stochastic fluctuations, allowing the apparition of critical germs of the new phase. In the case of recrystallisation, the underlying physical phenomenon is the progressive growth of subgrain structures leading to an unstable configuration, allowing a dislocation free grain to grow at the expense of a dislocated one. The two cases require different types of modelling which are presented in the article.
Mot clés : Précipitation cohérente, Recristallisation
@article{CRPHYS_2006__7_9-10_959_0,
author = {Yves Br\'echet and Georges Martin},
title = {Nucleation problems in metallurgy of the solid state: recent developments and open questions},
journal = {Comptes Rendus. Physique},
pages = {959--976},
publisher = {Elsevier},
volume = {7},
number = {9-10},
year = {2006},
doi = {10.1016/j.crhy.2006.10.014},
language = {en},
}
TY - JOUR AU - Yves Bréchet AU - Georges Martin TI - Nucleation problems in metallurgy of the solid state: recent developments and open questions JO - Comptes Rendus. Physique PY - 2006 SP - 959 EP - 976 VL - 7 IS - 9-10 PB - Elsevier DO - 10.1016/j.crhy.2006.10.014 LA - en ID - CRPHYS_2006__7_9-10_959_0 ER -
Yves Bréchet; Georges Martin. Nucleation problems in metallurgy of the solid state: recent developments and open questions. Comptes Rendus. Physique, Volume 7 (2006) no. 9-10, pp. 959-976. doi : 10.1016/j.crhy.2006.10.014. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2006.10.014/
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