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Equilibrium and Dynamic Properties of Dislocation Dipoles

Published online by Cambridge University Press:  26 July 2012

Patrick Veyssiere
Patrick Veyssiere*
Affiliation:
patrickv@onera.fr, CNRS-ONERA, LEM, BP 72, Chatillon-cedex, 92322, France, 33 1 46 73 44 40, 33 1 46 73 41 55
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Abstract

This paper embraces several aspects related to dislocation self-organization in single slip. The formation of prismatic loops, seminal to the nucleation and growth of dislocation braids, is a dynamical process involving elastic dipolar interactions. Preliminary simulations of the concerted process of loop generation are presented. Elastic properties of dislocation dipoles are analysed as a function of dipole character. Equilibrium properties are investigated under the isotropic and anisotropic elastic approximations. The orientation dependence of the so-called dipole passing stress is examined, and its implication in the elementary mechanisms that take place under constrained deformation conditions, such as fatigue cycling, are discussed.

Keywords

dislocationssimulationmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 976: Symposium EE – Size Effects in the Deformation of Materials – Experiments and Modeling , 2006 , 0976-EE02-04
Copyright
Copyright © Materials Research Society 2007

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