Defect accumulation and evolution during prolonged irradiation of Fe and FeCr alloys

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http://hdl.handle.net/10138/309166

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Granberg , F , Byggmästar , J & Nordlund , K 2020 , ' Defect accumulation and evolution during prolonged irradiation of Fe and FeCr alloys ' , Journal of Nuclear Materials , vol. 528 , 151843 . https://doi.org/10.1016/j.jnucmat.2019.151843

Title: Defect accumulation and evolution during prolonged irradiation of Fe and FeCr alloys
Author: Granberg, F.; Byggmästar, J.; Nordlund, K.
Contributor: University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
Date: 2020-01
Language: eng
Number of pages: 11
Belongs to series: Journal of Nuclear Materials
ISSN: 0022-3115
URI: http://hdl.handle.net/10138/309166
Abstract: The understanding of materials' behaviour during continuous irradiation is of great interest for utilizing materials in environments where harsh radiation is present, like nuclear power plants. Most power plants, both current and future ones, are based, at least partially, on Fe or FeCr alloys. In this study, we investigate the response of BCC Fe and several FeCr alloys to massively overlapping cascades. The effect of the added chromium on the defect accumulation and defect evolution was studied. Both a bulk setup, for observing the evolution deep inside the material far from grain boundaries and surfaces, and a setup with a nearby open surface, to investigate the effect of a permanent defect sink, were studied. We found that the primary defect production is similar in all materials, and also the build-up before serious overlap is comparable. When cascade overlap starts, we found that different sized clusters are formed in the different materials, depending on the setup. The defect cluster evolution was followed and could be related to the dislocation reactions in the materials. We found that the irradiation mixing was specific to the different chromium concentrations, the low chromium-containing alloy showed ordering, whereas the highest chromium-containing sample showed segregation. (C) 2019 The Authors. Published by Elsevier B.V.
Subject: Irradiation
Molecular dynamics
Iron
Chromium
Alloy
MOLECULAR-DYNAMICS SIMULATION
RADIATION-DAMAGE BUILDUP
DISPLACEMENT CASCADES
DISLOCATION LOOPS
CR
PRECIPITATION
TRANSITION
CLUSTERS
MOBILITY
CARBIDES
114 Physical sciences
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