On the formation mechanisms of intragranular ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
On the formation mechanisms of intragranular shear bands in olivine by stress-induced amorphization
Auteur(s) :
Idrissi, Hosni [Auteur]
Béché, Armand [Auteur]
Gauquelin, Nicolas [Auteur]
Ul-Haq, Ihtasham [Auteur]
Bollinger, Caroline [Auteur]
Demouchy, Sylvie [Auteur]
Verbeeck, Johan [Auteur]
Pardoen, Thomas [Auteur]
Schryvers, Dominique [Auteur]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Béché, Armand [Auteur]
Gauquelin, Nicolas [Auteur]
Ul-Haq, Ihtasham [Auteur]
Bollinger, Caroline [Auteur]
Demouchy, Sylvie [Auteur]
Verbeeck, Johan [Auteur]
Pardoen, Thomas [Auteur]
Schryvers, Dominique [Auteur]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Titre de la revue :
Acta Materialia
Nom court de la revue :
Acta Materialia
Numéro :
239
Pagination :
118247
Éditeur :
Elsevier BV
Date de publication :
2022-10-05
ISSN :
1359-6454
Résumé en anglais : [en]
Intragranular amorphization shear lamellae are found in deformed olivine aggregates. The detailed transmission electron microscopy analysis of intragranular lamella arrested in the core of a grain provides novel information ...
Lire la suite >Intragranular amorphization shear lamellae are found in deformed olivine aggregates. The detailed transmission electron microscopy analysis of intragranular lamella arrested in the core of a grain provides novel information on the amorphization mechanism. The deformation field is complex and heterogeneous, corresponding to a shear crack type instability involving mode I, II and III opening components. The formation and propagation of the amorphous lamella is accompanied by the formation of crystal defects ahead of the tip. These defects are geometrically necessary [001] dislocations, characteristics of high-stress deformation in olivine, and rotational nanodomains which are tentatively interpreted as disclinations. We show that these defects play an important role in dictating the path followed by the amorphous lamella. Stress-induced amorphization in olivine would thus result from a direct crystal-to-amorphous transformation associated with a shear instability and not from a mechanical destabilization due to the accumulation of high number of defects from an intense preliminary deformation. The preferential alignment of some lamellae along (010) is a proof of the lower ultimate mechanical strength of these planes.Lire moins >
Lire la suite >Intragranular amorphization shear lamellae are found in deformed olivine aggregates. The detailed transmission electron microscopy analysis of intragranular lamella arrested in the core of a grain provides novel information on the amorphization mechanism. The deformation field is complex and heterogeneous, corresponding to a shear crack type instability involving mode I, II and III opening components. The formation and propagation of the amorphous lamella is accompanied by the formation of crystal defects ahead of the tip. These defects are geometrically necessary [001] dislocations, characteristics of high-stress deformation in olivine, and rotational nanodomains which are tentatively interpreted as disclinations. We show that these defects play an important role in dictating the path followed by the amorphous lamella. Stress-induced amorphization in olivine would thus result from a direct crystal-to-amorphous transformation associated with a shear instability and not from a mechanical destabilization due to the accumulation of high number of defects from an intense preliminary deformation. The preferential alignment of some lamellae along (010) is a proof of the lower ultimate mechanical strength of these planes.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Non spécifiée
Projet Européen :
Établissement(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Équipe(s) de recherche :
Plasticité
Date de dépôt :
2022-08-16T16:08:17Z
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- Idrissi-et-al(2022)IntragranularAmorphousShearBandFormation.pdf
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