Advances in high-pressure materials rheology: from single-crystal to aggregate plasticity
Fabrice Detrez
(1)
,
O Castelnau
(2)
,
P Raterron
(3)
,
P Cordier
(3)
,
Sébastien Merkel
(3)
,
C Bollinger
(3)
,
N Hilairet
(3)
Fabrice Detrez
- Fonction : Auteur
- PersonId : 4487
- IdHAL : fabrice-detrez
- ORCID : 0000-0003-4745-8054
- IdRef : 133023281
O Castelnau
- Fonction : Auteur
- PersonId : 742592
- IdHAL : olivier-castelnau
- ORCID : 0000-0001-7422-294X
- IdRef : 253135869
P Cordier
- Fonction : Auteur
- PersonId : 1100869
- ORCID : 0000-0002-1883-2994
- IdRef : 060756780
Sébastien Merkel
- Fonction : Auteur
- PersonId : 3148
- IdHAL : sebastien-merkel
- ORCID : 0000-0003-2767-581X
- IdRef : 147966698
Résumé
The strongly anisotropic rheology of olivine and pyroxene single grains, associated to polycrystal microstructures, constitutes a key feature affecting the dynamics of the Earth's upper mantle. High pressure deformation experiments carried out on olivine single crystals under synchrotron radiation, together with estimations of lattice friction based on first-principle calculations, show a transition from easy [100] to easy [001] slips as pressure and temperature (thus depth) increases. Besides dislocation glide, diffusion related deformation mechanisms such as dislocation climb, diffusional creep, and grain boundary sliding cannot be completely ruled out. Since their behavior is poorly known, they are grouped into a single isotropic viscous component. We input these elementary deformation mechanisms into a mean-field homogenization scheme (second-order self-consistent scheme of Ponte-Castaneda) to assess the respective activation of deformation mechanisms and microstructure evolution (crystallographic texture) of olivine and olivine-pyroxene polycrystalline aggregates, for several flow path representative of in situ deformation.
Format du dépôt | Notice |
---|---|
Type de dépôt | Communication dans un congrès |
Titre |
en
Advances in high-pressure materials rheology: from single-crystal to aggregate plasticity
|
Résumé |
en
The strongly anisotropic rheology of olivine and pyroxene single grains, associated to polycrystal microstructures, constitutes a key feature affecting the dynamics of the Earth's upper mantle. High pressure deformation experiments carried out on olivine single crystals under synchrotron radiation, together with estimations of lattice friction based on first-principle calculations, show a transition from easy [100] to easy [001] slips as pressure and temperature (thus depth) increases. Besides dislocation glide, diffusion related deformation mechanisms such as dislocation climb, diffusional creep, and grain boundary sliding cannot be completely ruled out. Since their behavior is poorly known, they are grouped into a single isotropic viscous component. We input these elementary deformation mechanisms into a mean-field homogenization scheme (second-order self-consistent scheme of Ponte-Castaneda) to assess the respective activation of deformation mechanisms and microstructure evolution (crystallographic texture) of olivine and olivine-pyroxene polycrystalline aggregates, for several flow path representative of in situ deformation.
|
Auteur(s) |
Fabrice Detrez
1
, O Castelnau
2
, P Raterron
3
, P Cordier
3
, Sébastien Merkel
3
, C Bollinger
3
, N Hilairet
3
1
MSME -
Laboratoire de Modélisation et Simulation Multi Echelle
( 84321 )
- Université Paris-Est, 5 Bd Descartes, 77454 Marne-la-Vallée, Cedex 2
Université Paris-Est Créteil Val de Marne (UPEC) Faculté des Sciences et Technologie - Equipe de Biomécanique
61 avenue du général de Gaulle 94010 Créteil Cedex
- France
2
PIMM -
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
( 86289 )
- F-75013 Paris
- France
3
UMET -
Unité Matériaux et Transformations - UMR 8207
( 174496 )
- Université Lille 1
Bâtiment C6
59655 Villeneuve d'Ascq
- France
|
Langue du document |
Anglais
|
Vulgarisation |
Non
|
Actes |
Non
|
Comité de lecture |
Oui
|
Invité |
Non
|
Audience |
Internationale
|
Titre du congrès |
New Trends in Solid Mechanics: Coupled Fields and Multiscale Modelling
|
Date début congrès |
2013-06
|
Ville |
Castro Urdiales
|
Pays |
Espagne
|
Domaine(s) |
|
Projet(s) ANR |
|
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