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Dislocations, Mesoscale Simulations and Plastic Flow$
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Ladislas Kubin

Print publication date: 2013

Print ISBN-13: 9780198525011

Published to Oxford Scholarship Online: May 2013

DOI: 10.1093/acprof:oso/9780198525011.001.0001

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Obstacle-controlled Plastic Flow

Obstacle-controlled Plastic Flow

(p.27) 2 Obstacle-controlled Plastic Flow
Dislocations, Mesoscale Simulations and Plastic Flow

Ladislas Kubin

Oxford University Press

This chapter mainly discusses plastic flow in FCC crystals, where dislocations are intrinsically highly mobile, going from elementary dislocation mechanisms to dislocation microstructures and the mechanical response. Experimental aspects and the current state of the art in modelling are discussed. The elementary mechanisms are phonon drag, which governs free-flight velocities between obstacles, dislocation interactions and especially intersections and reactions, as well as cross-slip, which is a poorly known, complex and multiform core mechanisms. The formation of dislocation patterns and their properties have not been modelled convincingly until now. The strain-hardening stages are semi-quantitatively understood, except at very large strains, and are reasonably well described by dislocation-based continuous models. The recent discovery of intermittent flow and dislocation avalanches has triggered a lot of activity, and constitutes a breakthrough with many potential consequences.

Keywords:   phonon drag, dislocation reactions, cross-slip models, atomistic simulations, dislocation strengthening, dislocation patterns, deformation stages, dislocation patterns, dislocation avalanches

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