Phase field methods: Microstructures, mechanical properties and complexity

Alphonse Finel; Y. Le Bouar; A. Gaubert; U. Salman

doi:10.1016/j.crhy.2010.07.014

Computational metallurgy and changes of scale / Métallurgie numérique et changements d'échelle

Phase field methods: Microstructures, mechanical properties and complexity
[Méthodes de champs de phase : Microstructures, propriétés mécaniques et complexité]

Alphonse Finel ¹ ; Y. Le Bouar ¹ ; A. Gaubert ² ; U. Salman ¹

¹ Laboratoire d'étude des microstructures, CNRS/ONERA, BP 72, 92322 Châtillon, France
² DMSM, ONERA, BP 72, 92322 Châtillon, France

Comptes Rendus. Physique, Volume 11 (2010) no. 3-4, pp. 245-256.

Résumé
Abstract

Les matériaux à vocation structurale et fonctionnelle doivent leurs propriétés macroscopiques aux arrangements microstructuraux complexes qu'ils développent à l'échelle mésoscopique. Nous discutons ici des potentialités de la méthode des champs de phase à reproduire correctement les mécanismes physiques responsables de la formation de ces microstructures dans deux situations différentes. Premièrement, nous analysons les microstructures lamellaires observées dans les alliages martensitiques, et nous montrons que, en raison des larges rotations de réseau requises par les mécanismes d'accomodation élastique, une modélisation correcte des microstructures nécessite l'utilisation d'une formulation géométriquement non-linéaire. Deuxièmement, nous présentons un modèle champ de phase élasto-visco-plastique et montrons son application à la compréhension des phénomènes de mises en radeau observés dans les superalliages en fluage.

Structural and functional materials inherit their macroscopic properties from the complex microstructures they develop at mesoscale. We discuss here the ability of the phase field method to capture the physical mechanisms at the origin of these complex morphologies in two different situations. First, we analyze the polytwinned microstructures observed in martensitic alloys, and show that, due to the large rotations involved in the accommodation mechanism, a correct modeling of the microstructures requires the use of a geometrically nonlinear model. Second, we present an elasto-viscoplastic phase field model and show its application to the understanding of the rafting phenomena observed in superalloys under creep.

Publié le : 2010-04-01

DOI : 10.1016/j.crhy.2010.07.014

Keywords: Phase field method, Polytwinned microstructure, Elasto-viscoplastic phase field model
Mot clés : Méthode des champs de phase, Microstructure lamellaire, Modèle champ de phase élasto-visco-plastique

Affiliations des auteurs :

Alphonse Finel ¹ ; Y. Le Bouar ¹ ; A. Gaubert ² ; U. Salman ¹

¹ Laboratoire d'étude des microstructures, CNRS/ONERA, BP 72, 92322 Châtillon, France
² DMSM, ONERA, BP 72, 92322 Châtillon, France

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     author = {Alphonse Finel and Y. Le Bouar and A. Gaubert and U. Salman},
     title = {Phase field methods: {Microstructures,} mechanical properties and complexity},
     journal = {Comptes Rendus. Physique},
     pages = {245--256},
     publisher = {Elsevier},
     volume = {11},
     number = {3-4},
     year = {2010},
     doi = {10.1016/j.crhy.2010.07.014},
     language = {en},
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Alphonse Finel; Y. Le Bouar; A. Gaubert; U. Salman. Phase field methods: Microstructures, mechanical properties and complexity. Comptes Rendus. Physique, Volume 11 (2010) no. 3-4, pp. 245-256. doi : 10.1016/j.crhy.2010.07.014. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.07.014/

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