Dijous 11 de juny, el Dipòsit Digital no estarà operatiu de 15:00 a 17:00 h per tasques de manteniment. Disculpeu les molèsties.
El jueves 11 de Junio, el Dipòsit Digital no estará operativo de 15:00 a 17:00 h debido a tareas de mantenimiento. Disculpen las molestias.
Thursday, Jun 11th, the Digital Repository will be unavailable due to a system update.

Files

516239.pdf (314.41 KB)

Document type

Article

Version

Published version

Publication date

2004

All rights reserved

Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/10906

Depinning transition of dislocation assemblies: Pileups and low-angle grain boundaries

Journal Title

Authors

Director/Tutor

Journal ISSN

Volume Title

Related resource

http://dx.doi.org/10.1103/PhysRevB.69.214103

Abstract

We investigate the depinning transition occurring in dislocation assemblies. In particular, we consider the cases of regularly spaced pileups and low-angle grain boundaries interacting with a disordered stress landscape provided by solute atoms, or by other immobile dislocations present in nonactive slip systems. Using linear elasticity, we compute the stress originated by small deformations of these assemblies and the corresponding energy cost in two and three dimensions. Contrary to the case of isolated dislocation lines, which are usually approximated as elastic strings with an effective line tension, the deformations of a dislocation assembly cannot be described by local elastic interactions with a constant tension or stiffness. A nonlocal elastic kernel results as a consequence of long-range interactions between dislocations. In light of this result, we revise statistical depinning theories of dislocation assemblies and compare the theoretical results with numerical simulations and experimental data.

Subject

Matèria condensada, Regla de les fases i equilibri, Propietats mecàniques, Propietats acústiques, Cristal·lografia

Subject (English)

Condensed matter, Equations of state, Phase rule and equilibrium, Mechanical properties, Acoustic properties, Crystallography

Citation

Collections

Articles publicats en revistes (Física de la Matèria Condensada)

Citation

MORETTI, Paolo, et al. Depinning transition of dislocation assemblies: Pileups and low-angle grain boundaries. Physical Review B. 2004. Vol. 69, num. 21, pags. 214103-1-214103-11. ISSN 0163-1829. [consulted: 12 of June of 2026]. Available at: https://hdl.handle.net/2445/10906

Export metadata

JSON - METS

Share record