Direct observation of the spatial distribution of primary cascade damage in tungsten

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http://hdl.handle.net/10138/307860

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Mason , D R , Sand , A E , Yi , X & Dudarev , S L 2018 , ' Direct observation of the spatial distribution of primary cascade damage in tungsten ' , Acta Materialia , vol. 144 , pp. 905-917 . https://doi.org/10.1016/j.actamat.2017.10.031

Title: Direct observation of the spatial distribution of primary cascade damage in tungsten
Author: Mason, D. R.; Sand, A. E.; Yi, X.; Dudarev, S. L.
Contributor: University of Helsinki, Department of Physics
Date: 2018-02-01
Language: eng
Number of pages: 13
Belongs to series: Acta Materialia
ISSN: 1359-6454
URI: http://hdl.handle.net/10138/307860
Abstract: Recently we have presented direct experimental evidence for large defect clusters being formed in primary damage cascades in self-ion irradiated tungsten [Yi et al., EPL 110:36001 (2015)]. This large size is significant, as it implies that strong elastic interaction between the defects will affect their subsequent evolution, especially if defects are formed close together. Here we present a direct experimental observation of the separation between visible defects in self-ion irradiated tungsten, in the form of a 2d pairwise radial distribution function extracted from transmission electron micrographs (TEM). We also present a detailed analysis of the observed radial distribution function, and infer the probable size and shape of individual cascades. We propose and validate a simple exponential form for the spatial distribution of defects within a single cascade. The cascade statistics necessary have been acquired by developing an automated procedure for analysing black-dot damage in TEM micrographs. We confirm that the same model also produces a high-quality fit to the separation between larger defects observed in MD simulations. For the first time we present experimental evidence for the sub-nanometre-scale spatial distribution of defect clusters within individual cascades. (C) 2017 EURATOM. Published by Elsevier Ltd on behalf of Acta Materialia Inc. All rights reserved.
Subject: Irradiation damage
Electron microscopy
Defect clusters
Spatial correlation
MONTE-CARLO-SIMULATION
MOLECULAR-DYNAMICS
RADIATION-DAMAGE
DISPLACEMENT CASCADES
COLLISION CASCADES
DISLOCATION LOOPS
POTENTIALS
DEFECTS
SOLIDS
METALS
114 Physical sciences
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