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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
Condensed matter
Equations of state
Phase rule and equilibrium
Mechanical properties
Acoustic properties
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
It is part of: Physical Review B, 2004, vol. 69, núm. 21, p. 214103-1-214103-11
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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