☆ 4.7 Article

Object kinetic Monte Carlo model for neutron and ion irradiation in tungsten: Impact of transmutation and carbon impurities

JOURNAL OF NUCLEAR MATERIALS (2018)

Journal

JOURNAL OF NUCLEAR MATERIALS

Volume 500, Issue -, Pages 15-25

Publisher

ELSEVIER SCIENCE BV

DOI: 10.1016/j.jnucmat.2017.12.014

Keywords

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Categories

Materials Science, Multidisciplinary Nuclear Science & Technology

Funding

Euratom research and training programme [633053]

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Abstract

We upgrade our object kinetic Monte Carlo (OKMC) model, aimed at describing the microstructural evolution in tungsten (W) under neutron and ion irradiation. Two main improvements are proposed based on recently published atomistic data: (a) interstitial carbon impurities, and their interaction with radiation-induced defects (point defect clusters and loops), are more accurately parameterized thanks to ab initio findings; (b) W transmutation to rhenium (Re) upon neutron irradiation, impacting the diffusivity of radiation defects, is included, also relying on recent atomistic data. These essential amendments highly improve the portability of our OKMC model, providing a description for the formation of SIA-type loops under different irradiation conditions. The model is applied to simulate neutron and ion irradiation in pure W samples, in a wide range of fluxes and temperatures. We demonstrate that it performs a realistic prediction of the population of TEM-visible voids and loops, as compared to experimental evidence. The impact of the transmutation of W to Re, and of carbon trapping, is assessed. (C) 2017 SCK.CEN, Belgium. Published by Elsevier B.V. All rights reserved.

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