[Recristallisation dynamique et comportement mécanique de l’alliage de magnésium AZ31 : Contraintes issues d’essais de traction avec analyse EBSD in-situ]
Nous avons réalisé des essais de traction sur des échantillons de Mg AZ31 avec acquisition EBSD in situ à 250°C et 10-3 s-1 pour caractériser l’évolution de la recristallisation dynamique (DRX) et son effet sur le comportement mécanique. Pour étudier toute la gamme de déformation jusqu’à la rupture à 65-67% de déformation ingénieure, des expériences ont été menées avec une acquisition EBSD in situ à des intervalles de déformation de 2-5% et repolissage des échantillons à des intervalles de 15% de déformation. Les observations microstructurales in situ et statistique des propriétés microstructurales documentent une DRX continue avec germination par association de bulging et de rotation des sous-grains à partir de déformations aussi faibles que 6%. Cependant, la microstructure évolue lentement, principalement par le développement de sous-structure (polygonisation), avec une DRX se limitant à des amas isolés, jusqu’à une déformation de 35%. Cette longue période d’incubation est suivie d’une accélération de la DRX, avec une migration plus rapide des joints de grains permettant le développement d’une structure de DRX en collier, dont l’hétérogénéité spatiale contrôle la localisation finale de la déformation à des déformations > 60%. L’évolution microstructurale contraste avec le comportement mécanique global, qui montre une diminution linéaire du taux de durcissement entre 15 et 60% de déformation. La comparaison de l’évolution de la texture observée avec les prédictions par des simulations de plasticité polycristalline sans DRX montre que les changements de texture induits par DRX contrecarrent le durcissement géométrique dû à l’évolution de la texture résultant du glissement de dislocation. Un adoucissement microstructural est néanmoins nécessaire pour compenser le durcissement dû à l’augmentation de la densité de dislocation. L’intensité de cet adoucissement doit augmenter de façon continue avec la déformation pour expliquer la diminution du taux de durcissement entre 15% et 60% de déformation. L’écart apparent entre la cinétique de l’évolution microstructurale et le comportement mécanique implique cependant que l’adoucissement global ne dépend pas uniquement de la fraction volumique recristallisée, mais aussi de son organisation spatiale.
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We conducted tensile tests on Mg AZ31 samples with in-situ EBSD acquisition at 250°C and 10-3 s-1 to characterize the evolution of dynamic recrystallization (DRX) and its effect on the mechanical behavior. To investigate the entire deformation range up to failure at 65-67% engineering strain, step-wise experiments were conducted with in-situ EBSD acquisition at 2-5% strain intervals. Both in-situ microstructural observations and statistical analysis of microstructural properties document continuous DRX with nucleation by association of bulging and subgrain rotation starting at strains as low as 6%. However, the microstructure evolves slowly, mainly by development of substructure (polygonization), with DRX limited to isolated clusters, until 35% strain. This long incubation period is followed by acceleration of DRX, with faster grain boundary migration allowing for development of a DRX-necklace structure, whose spatial heterogeneity controls the final strain localization at strains > 60%. The microstructural evolution contrasts with the bulk mechanical behavior, which displays a linear decrease in the hardening rate between 15 and 60% strain. Comparison of the observed texture evolution with predictions by polycrystal plasticity simulations without DRX shows that DRX-induced changes in texture counteract the geometrical hardening due to the texture evolution resulting from dislocation glide. Microstructural softening is, nevertheless, required to compensate for hardening due to increase in the dislocation density. The intensity of this softening has to steadily increase with strain to explain the decrease in hardening rate between 15% and 60% strain. The apparent discrepancy between the kinetics of the microstructural evolution and the mechanical behavior implies, however, that the bulk softening does not depend solely on the DRX volume fraction, but also on its spatial organization.
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Mots-clés : Recristallisation dynamique, alliage Mg, EBSD quasi in-situ, texture
Gaëtan Boissonneau 1 ; Andréa Tommasi 1 ; Fabrice Barou 1 ; Marco Antonio Lopez-Sanchez 2 ; Maurine Montagnat 3
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@article{CRMECA_2025__353_G1_235_0,
author = {Ga\"etan Boissonneau and Andr\'ea Tommasi and Fabrice Barou and Marco Antonio Lopez-Sanchez and Maurine Montagnat},
title = {Dynamic recrystallization and mechanical behavior of {Mg} alloy {AZ31:} {Constraints} from tensile tests with in-situ {EBSD} analysis},
journal = {Comptes Rendus. M\'ecanique},
pages = {235--258},
publisher = {Acad\'emie des sciences, Paris},
volume = {353},
year = {2025},
doi = {10.5802/crmeca.267},
language = {en},
}
TY - JOUR AU - Gaëtan Boissonneau AU - Andréa Tommasi AU - Fabrice Barou AU - Marco Antonio Lopez-Sanchez AU - Maurine Montagnat TI - Dynamic recrystallization and mechanical behavior of Mg alloy AZ31: Constraints from tensile tests with in-situ EBSD analysis JO - Comptes Rendus. Mécanique PY - 2025 SP - 235 EP - 258 VL - 353 PB - Académie des sciences, Paris DO - 10.5802/crmeca.267 LA - en ID - CRMECA_2025__353_G1_235_0 ER -
%0 Journal Article %A Gaëtan Boissonneau %A Andréa Tommasi %A Fabrice Barou %A Marco Antonio Lopez-Sanchez %A Maurine Montagnat %T Dynamic recrystallization and mechanical behavior of Mg alloy AZ31: Constraints from tensile tests with in-situ EBSD analysis %J Comptes Rendus. Mécanique %D 2025 %P 235-258 %V 353 %I Académie des sciences, Paris %R 10.5802/crmeca.267 %G en %F CRMECA_2025__353_G1_235_0
Gaëtan Boissonneau; Andréa Tommasi; Fabrice Barou; Marco Antonio Lopez-Sanchez; Maurine Montagnat. Dynamic recrystallization and mechanical behavior of Mg alloy AZ31: Constraints from tensile tests with in-situ EBSD analysis. Comptes Rendus. Mécanique, Volume 353 (2025), pp. 235-258. doi : 10.5802/crmeca.267. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.267/
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