Titre :

<110>{110} edge dislocations in strontium titanate: Charged vs neutral, glide vs climb

Auteur(s) :

Hirel, Pierre [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Institut universitaire de France [IUF]
Carrez, Philippe [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207

Titre de la revue :

Acta Materialia

Nom court de la revue :

Acta Materialia

Numéro :

285

Pagination :

120636

Éditeur :

Elsevier

Date de publication :

2025-02-15

ISSN :

1359-6454

Mot(s)-clé(s) en anglais :

Numerical simulation
SrTiO3
Dislocation

Discipline(s) HAL :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Planète et Univers [physics]/Sciences de la Terre

Résumé en anglais : [en]

The ductile deformation of strontium titanate SrTiO3 at low temperature (T⪅ 1000 K) is commonly associated with the activity of dislocations gliding in {110} slip planes. While dislocations with pure screw character keep ...
Lire la suite >The ductile deformation of strontium titanate SrTiO3 at low temperature (T⪅ 1000 K) is commonly associated with the activity of dislocations gliding in {110} slip planes. While dislocations with pure screw character keep essentially the same dissociated core structure in the whole temperature range, dislocations with edge character may adopt different atomic configurations, associated with different charge states and different mobilities. In this work we use atomic-scale simulations to investigate the core structure of charged and neutral edge dislocations. We report a new possible dislocation core that is charge-neutral, dissociated, and with the lowest Peierls stress reported so far, thus making it an efficient component of plastic deformation. In comparison, dislocations carrying a positive charge are slightly less mobile, while those with negative charge have a very low mobility. Our results indicate that glide of charge-neutral dislocations is favoured, and that they may locally acquire a charge by interacting with vacancies all while remaining glissile. Finally, we investigate edge dislocations that are dissociated in their climb plane, and confirm that they are energetically more favourable than their glissile counterparts. Computing the activation energy for the core transformation provides insight into the ductile–brittle transition.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Projet Européen :

Rheology of Earth materials: closing the gap between TIMEscales in the laboratory and in the MANtle

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Plasticité

Date de dépôt :

2025-01-15T15:34:42Z
2025-01-16T14:50:04Z