On the onset of void swelling in pure tungsten under neutron irradiation : An object kinetic Monte Carlo approach

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http://hdl.handle.net/10138/307811

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Castin , N , Bakaev , A , Bonny , G , Sand , A E , Malerba , L & Terentyev , D 2017 , ' On the onset of void swelling in pure tungsten under neutron irradiation : An object kinetic Monte Carlo approach ' , Journal of Nuclear Materials , vol. 493 , pp. 280-293 . https://doi.org/10.1016/j.jnucmat.2017.06.008

Title: On the onset of void swelling in pure tungsten under neutron irradiation : An object kinetic Monte Carlo approach
Author: Castin, N.; Bakaev, A.; Bonny, G.; Sand, A. E.; Malerba, L.; Terentyev, D.
Contributor: University of Helsinki, Department of Physics
Date: 2017-09
Language: eng
Number of pages: 14
Belongs to series: Journal of Nuclear Materials
ISSN: 0022-3115
URI: http://hdl.handle.net/10138/307811
Abstract: We propose an object kinetic Monte Carlo (OKMC) model for describing the microstructural evolution in pure tungsten under neutron irradiation. We here focus on low doses ( under 1 dpa), and we neglect transmutation in first approximation. The emphasis is mainly centred on an adequate description of neutron irradiation, the subsequent introduction of primary defects, and their thermal diffusion properties. Besides grain boundaries and the dislocation network, our model includes the contribution of carbon impurities, which are shown to have a strong influence on the onset of void swelling. Our parametric study analyses the quality of our model in detail, and confronts its predictions with experimental microstructural observations with satisfactory agreement. We highlight the importance for an accurate determination of the dissolved carbon content in the tungsten matrix, and we advocate for an accurate description of atomic collision cascades, in light of the sensitivity of our results with respect to correlated recombination. (C) 2017 Published by Elsevier B.V.
Subject: Tungsten
Kinetic Monte Carlo
Neutron irradiation
Void swelling
NANOSTRUCTURE EVOLUTION
FUSION ENERGY
AB-INITIO
ALLOYS
SIMULATIONS
REACTORS
DEFECTS
VACANCY
SYSTEMS
MODEL
114 Physical sciences
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