Surface effects and statistical laws of defects in primary radiation damage : Tungsten vs. iron

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Sand , A E , Aliaga , M J , Caturla , M J & Nordlund , K 2016 , ' Surface effects and statistical laws of defects in primary radiation damage : Tungsten vs. iron ' , Europhysics Letters , vol. 115 , no. 3 , 36001 . https://doi.org/10.1209/0295-5075/115/36001

Title: Surface effects and statistical laws of defects in primary radiation damage : Tungsten vs. iron
Author: Sand, A. E.; Aliaga, M. J.; Caturla, M. J.; Nordlund, K.
Contributor organization: Department of Physics
Date: 2016-08
Language: eng
Number of pages: 6
Belongs to series: Europhysics Letters
ISSN: 0295-5075
DOI: https://doi.org/10.1209/0295-5075/115/36001
URI: http://hdl.handle.net/10138/229235
Abstract: We have investigated the effect of surfaces on the statistics of primary radiation damage, comparing defect production in the bcc metals iron (Fe) and tungsten (W). Through molecular dynamics simulations of collision cascades we show that vacancy as well as interstitial cluster sizes follow scaling laws in both bulk and thin foils in these materials. The slope of the vacancy cluster size distribution in Fe is clearly affected by the surface in thin foil irradiation, while in W mainly the overall frequency is affected. Furthermore, the slopes of the power law distributions in bulk Fe are markedly different from those in W. The distinct behaviour of the statistical distributions uncovers different defect production mechanisms effective in the two materials, and provides insight into the underlying reasons for the differing behaviour observed in TEM experiments of lowdose ion irradiation in these metals. Copyright (C) EPLA, 2016
Subject: MOLECULAR-DYNAMICS SIMULATIONS
COLLISION CASCADES
DISPLACEMENT CASCADES
DISLOCATION LOOPS
ION IRRADIATIONS
ENERGY
FE
POTENTIALS
METALS
114 Physical sciences
Peer reviewed: Yes
Rights: other
Usage restriction: openAccess
Self-archived version: acceptedVersion


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