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A Diffuse Interface Model for Void Formation under Non-Equilibrium Irradiation

Published online by Cambridge University Press:  14 December 2011

Srujan Rokkam  and
Anter El-Azab
Srujan Rokkam
Affiliation:
Mechanical Engineering Department, Florida State University, Tallahassee, FL 32310, USA
Anter El-Azab
Affiliation:
Department of Scientific Computing, Florida State University, 415 Dirac Science Library, Tallahassee, FL 32306-4120, USA
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Abstract

Void formation in irradiated materials is an intriguing and technologically important physical process associated with radiation damage. In this communication, we present a diffuse interface model for simulating void formation in materials under irradiation. Voids are treated as aggregates of vacancies left from the cascade damage. The emergence of the void ensembles in the irradiated material is modeled by an Allen-Cahn equation coupled with two Cahn-Hilliard equations governing the space and time evolution of vacancies and interstitials. The governing system of equations includes stochastic generation of point defects representing the cascade process, reaction of vacancies and interstitials, interaction of point defects with extended defects (viz., void surface and grain boundaries) and thermal fluctuations in defects. Numerical simulations demonstrating the model capabilities with respect to nucleation and growth of voids and swelling of the irradiated material are presented.

Keywords

radiation effectsnuclear materialsnucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1363: Symposium RR – Fundamental Science of Defects and Microstructure in Advanced Materials for Energy , 2011 , mrss11-1363-rr07-04
Copyright
Copyright © Materials Research Society 2011

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References

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