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HomeMaterials Science ForumMaterials Science Forum Vol. 736Dislocation Dynamics Simulations

Dislocation Dynamics Simulations

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Abstract:

Dislocation Dynamics (DD) simulations are used to study the evolution of a pre-specified dislocation structure under applied stresses and imposed boundary conditions. These simulations can handle realistic dislocation densities ranging from 10¹⁰ to 10¹⁴ m^-2, and hence can be used to model plastic deformation and strain hardening in metals. In this paper we introduce the basic concepts of DD simulations and then present results from simulations in thin copper films and in bulk zirconium. In both cases, the effect of orientation on deformation behaviour is investigated. For the thin film simulations, rigid boundary conditions are used at film-substrate and film-passivation interfaces leading to dislocation accumulation, while periodic boundaries are used for bulk grains of Zr. We show that there is a clear correlation between strain hardening rate and the rate of increase of dislocation density.

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Advances in Materials Development

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Periodical:

Materials Science Forum (Volume 736)

Pages:

13-20

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.736.13

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Online since:

December 2012

Authors:

Karri V. Mani Krishna, Prita Pant

Keywords:

Dislocation Dynamics, Orientation, Thin Film, Zirconium

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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