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http://hdl.handle.net/2445/10906
Title: | Depinning transition of dislocation assemblies: Pileups and low-angle grain boundaries |
Author: | Moretti, Paolo Miguel López, María del Carmen Zaiser, Michael Zapperi, Stefano |
Keywords: | Matèria condensada Regla de les fases i equilibri Propietats mecàniques Propietats acústiques Cristal·lografia Condensed matter Equations of state Phase rule and equilibrium Mechanical properties Acoustic properties Crystallography |
Issue Date: | 2004 |
Publisher: | The American Physical Society |
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. |
Note: | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.69.214103 |
It is part of: | Physical Review B, 2004, vol. 69, núm. 21, p. 214103-1-214103-11 |
URI: | http://hdl.handle.net/2445/10906 |
Related resource: | http://dx.doi.org/10.1103/PhysRevB.69.214103 |
ISSN: | 0163-1829 |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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