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ANR DREAM

Projet ANR DREAM - Dynamic REcrystallization in Anisotropic Materials (2014-2018)

par Maurine Montagnat Rentier - 14 février 2017

The project DREAM is financed by the French National Research Agency (ANR) during the period 2014-2018.

n° ANR-13-BS09-0001-01

Contact : maurine.montagnat(at)univ-grenoble-alpes.fr


Participants

- IGE : Maurine Montagnat (P.I.), Thomas Chauve (PhD), Baptiste Journaux (Post-doc), Laurent Arnaud, Olivier Alemany
- Géosciences Montpellier : Andrea Tommasi, David Mainprice, Fabrice Barou, Hidas Karoly (Post-doc)
- LEM3 : Thiebaud Richeton, Tuan Lu LE (post-doc), Claude Fressengeas, Stéphane Berbenni, Mikhail Lebedkin
- CEMEF : Marc Bernacki
- EPSL : Roland Logé
- ILL : Bachir Ouladdiaf

Publications

*- T. Richeton, L.T. Le, T. Chauve, M. Bernacki, S. Berbenni and M. Montagnat. Modelling the transport of geometrically necessary dislocations on slip systems : application to single- and multi-crystals of ice. 2017. Modelling Simul. Mater. Sci. Eng. 25, 025010.
*- Chauve T, Montagnat M, Barou F, Hidas K, Tommasi A, Mainprice D. 2017 Investigation of nucleation processes during dynamic recrystallization of ice using cryo-EBSD. Phil. Trans. R. Soc. A 375 : 20150345. http://dx.doi.org/10.1098/rsta.2015.0345
*- M. Montagnat, T. Chauve, F. Barou, A. Tommasi, B. Beausir, C. Fressengeas. Analysis of dynamic recrystallization of ice from EBSD orientation mapping. 2015. Frontiers In Earth Sciences. 3:81.
*- T. Chauve, M. Montagnat and P. Vacher. Strain field evolution during dynamic recrystallization nucleation ; a case study on ice. Acta Materialia, 2015, 101, 116-124 .
*- S. Piazolo, M. Montagnat, F. Grennerat, H. Moulinec, J. Wheeler. Effect of local stress heterogeneities on dislocation fields : Examples from transient creep in polycrystalline ice. Acta Materialia, 2015, 90, 0, 303-309.

News

- The DREAM "team" is happy to announce the creation of the new GDR "Recristallisation et croissance des grains" (2006) for the period 2017-2021.
More information on the GDR site

- The DREAM "team" has been strongly involved in the Thematic School on Recrystallization, November 2016 in Sète (more here)

- The DREAM modeling results were presented at the European Mechanics of Materials Conference, September 2016.

- The DREAM results on ice were presented during an invited talk at the Gordon conference on Rock Deformation, August 2016.

- Annual meeting in Paris 30-31 of Mai 2016.

- The DREAM results were presented at the AGU annual conference in San Francisco, with 4 presentations !

- Annual meeting took place in October 8 and 9, 2015.

- The DREAM results were presented at the international conference CREEP 2015 in Toulouse, early June 2015, with two talks, and one invited talk (T. Chauve et al., K. Hidas et al., M. Montagnat et al.)

- The DREAM team has been highly active during the first Summer School on Recrystallization with one member as the main organizer, 4 members as speakers, and 5 members as participants.

The summer school was financed by the ESF research networking Programme MicroDIce, by CNRS, and organized in the frame of the GDR3436 Recrystallization (2010-2014).

- Annual meeting took place in Grenoble, October 26, 2014.

Aim of the project :

Knowledge of the evolution of microstructure (grains size and shape) and texture (or crystal preferred orientations) during deformation, recrystallization, and phase transformations is fundamental in both Material and Earth Sciences, since physical properties of crystalline materials like rocks, ice, metals, ceramics, and even some polymers and organic compounds, are strongly dependent on the orientation of their constitutive crystals. Texturing of crystalline materials leads to anisotropic physical properties.
The main objective of this project is to unravel the links between heterogeneities in dislocation and internal stress fields, stored energy, and nucleation mechanisms during DRX. This knowledge is essential to
implement DRX processes in numerical modeling approaches of varying degrees of complexity.
A second objective is to provide mechanically-based kinetic laws for grain boundary motion in DRX, based on the elastic/plastic compatibility conditions at interfaces required from a continuum approach of surfaces of
discontinuity in elasto-plastic materials.

The team :

The project DREAM gathers scientists with strong competencies and knowledges in different fields of material sciences. The final objectives and applications are multi-disciplinary, but all partners share a common interest for the fundamental processes controlling dynamic recrystallization.
LGGE and Géosciences Montpellier have a strong experience in experimental development, ranging from mechanical test to EBSD. The modeling competencies, from physical-based model conception, numerical development and validation, are gathered at LEM3 and CEMEF in a complementary way.

The project frame can be summarized as follows :

PARTNERS

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Instituts INSIS and INSU