Atomic core structure and mobility of ...
Document type :
Article dans une revue scientifique: Article original
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Title :
Atomic core structure and mobility of [100](010) and [010](100) dislocations in MgSiO3 perovskite
Author(s) :
Hirel, Pierre [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Kraych, Antoine [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Carrez, Philippe [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Unité Matériaux et Transformations - UMR 8207 [UMET]
Kraych, Antoine [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Carrez, Philippe [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]
Cordier, Patrick [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]
Journal title :
Acta Materialia
Volume number :
79
Pages :
117-125
Publication date :
2014
English keyword(s) :
Computer simulation
Perovskites
Crystal plasticity
Dislocations
Pressure-dependent plasticity
Perovskites
Crystal plasticity
Dislocations
Pressure-dependent plasticity
HAL domain(s) :
Planète et Univers [physics]/Sciences de la Terre
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
English abstract : [en]
The plastic behavior of MgSiO3 perovskite is investigated under pressure conditions similar to those encountered in the Earth’s lower mantle. The core structures of dislocations with edge and screw characters are determined ...
Show more >The plastic behavior of MgSiO3 perovskite is investigated under pressure conditions similar to those encountered in the Earth’s lower mantle. The core structures of dislocations with edge and screw characters are determined by means of atomic-scale simulations for the [1 0 0](0 1 0) and [0 1 0](1 0 0) slip systems. The corresponding Peierls stresses increase monotonously with increasing pressure. The edge [0 1 0](1 0 0) dislocation is found to dissociate by climb and to become sessile at high pressure ( GPa). These findings are compared with a continuum Peierls–Nabarro model and with published results in other perovskite materials.Show less >
Show more >The plastic behavior of MgSiO3 perovskite is investigated under pressure conditions similar to those encountered in the Earth’s lower mantle. The core structures of dislocations with edge and screw characters are determined by means of atomic-scale simulations for the [1 0 0](0 1 0) and [0 1 0](1 0 0) slip systems. The corresponding Peierls stresses increase monotonously with increasing pressure. The edge [0 1 0](1 0 0) dislocation is found to dissociate by climb and to become sessile at high pressure ( GPa). These findings are compared with a continuum Peierls–Nabarro model and with published results in other perovskite materials.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
European Project :
Administrative institution(s) :
Université de Lille
ENSCL
CNRS
INRA
ENSCL
CNRS
INRA
Collections :
Research team(s) :
Plasticité
Submission date :
2019-05-16T16:44:35Z
2020-04-16T14:18:03Z
2020-04-16T14:18:03Z
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