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Title of Journal: Sci China Phys Mech Astron

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Abbravation: Science China Physics, Mechanics and Astronomy

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SP Science China Press

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DOI

10.1007/bf01655082

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1869-1927

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Phasefield modeling of void evolution and swellin

Authors: YuLan Li ShenYang Hu Xin Sun Fei Gao Charles H Henager Mohammad Khaleel
Publish Date: 2011/04/03
Volume: 54, Issue: 5, Pages: 856-865
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Abstract

Void swelling is an important phenomenon observed in both nuclear fuels and cladding materials in operating nuclear reactors In this work we develop a phasefield model to simulate void evolution and void volume change in irradiated materials Important material processes including the generation of defects such as vacancies and selfinterstitials their diffusion and annihilation and void nucleation and evolution have been taken into account in this model The thermodynamic and kinetic properties such as chemical free energy interfacial energy vacancy mobility and annihilation rate of vacancies and interstitials are expressed as a function of temperature and/or defect concentrations in a general manner The model allows for parametric studies of critical void nucleus size void growth kinetics and void volume fraction evolutions Our simulations demonstrated that void swelling displays a quasibell shape distribution with temperature often observed in experiments

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