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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

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