Radiation damage in tungsten from cascade overlap with voids and vacancy clusters

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http://hdl.handle.net/10138/304669

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Fellman , A , Sand , A E , Byggmästar , J & Nordlund , K 2019 , ' Radiation damage in tungsten from cascade overlap with voids and vacancy clusters ' , Journal of Physics. Condensed Matter , vol. 31 , no. 40 , 405402 . https://doi.org/10.1088/1361-648X/ab2ea4

Title: Radiation damage in tungsten from cascade overlap with voids and vacancy clusters
Author: Fellman, A.; Sand, A. E.; Byggmästar, Jesper; Nordlund, Kai
Contributor: University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Faculty of Science
Date: 2019-10-09
Language: eng
Number of pages: 12
Belongs to series: Journal of Physics. Condensed Matter
ISSN: 0953-8984
URI: http://hdl.handle.net/10138/304669
Abstract: We have performed a systematic molecular dynamics investigation of the effects of overlap of collision cascades in tungsten with pre-existing vacancy-type defects. In particular, we focus on the implications for fusion neutron irradiated tungsten in relation to comparisons with damage production under ion irradiation conditions. We find that overlap of a cascade with a vacancy-type defect decreases the number of new defects with roughly the same functional dependence as previously shown for interstitial clusters. We further find that different mechanisms govern the formation of dislocation loops, resulting in different Burgers vectors, depending on the degree of overlap between the cascade and the defect. Furthermore, we show that overlapping cascades consistently decrease the size of the pre-existing defect. We also observe void-induced cascade splitting at energies far below the subcascade splitting threshold in tungsten. The impact of these mechanisms on radiation damage accumulation and dose rate effects are discussed.
Subject: ALLOYS
DEFECT PRODUCTION
DISLOCATION LOOPS
EVOLUTION
IN-SITU
MOLECULAR-DYNAMICS SIMULATION
NEUTRON-IRRADIATION
PURE TUNGSTEN
cascade overlap
dislocation loops
molecular dynamics
radiation damage
tungsten
voids
114 Physical sciences
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