Effects of cascade-induced dislocation structures on the long-term microstructural evolution in tungsten

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http://hdl.handle.net/10138/343195

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Bonny , G , Castin , N , Bakaev , A , Sand , A E & Terentyev , D 2020 , ' Effects of cascade-induced dislocation structures on the long-term microstructural evolution in tungsten ' , Computational Materials Science , vol. 181 , 109727 . https://doi.org/10.1016/j.commatsci.2020.109727

Title: Effects of cascade-induced dislocation structures on the long-term microstructural evolution in tungsten
Author: Bonny, G.; Castin, N.; Bakaev, A.; Sand, A. E.; Terentyev, D.
Contributor organization: Department of Physics
Materials Physics
Date: 2020-08
Language: eng
Number of pages: 10
Belongs to series: Computational Materials Science
ISSN: 0927-0256
DOI: https://doi.org/10.1016/j.commatsci.2020.109727
URI: http://hdl.handle.net/10138/343195
Abstract: In recent years, a number of systematic investigations of high-energy collision cascades in tungsten employing advanced defect analysis tools have shown that interstitial clusters can form complex non-planar dislocation structures. These structures are sessile in nature and may potentially have a strong impact on the long-term evolution of the radiation microstructure. To clarify this aspect, we selected several representative primary damage states of cascades debris and performed annealing simulations using molecular dynamics (MD). We found that immobile complexes of non-planar dislocation structures (CDS) evolve into glissile and planar shaped 1/2 <1 1 1 > loops with an activation energy of similar to 1.5 eV. The CDS objects were implemented in an object kinetic Monte Carlo (OKMC) model accounting for the event of transformation into 1-D migrating loops, following the MD data. OKMC was then used to investigate the impact of the transformation event (and the associated activation energy) on the evolution of the microstructure.
Subject: Cascade ageing
Tungsten
Molecular dynamics
Object kinetic Monte Carlo
NEUTRON-IRRADIATED TUNGSTEN
MONTE-CARLO MODEL
RADIATION-DAMAGE
ION IRRADIATION
CLUSTERS
DEFECTS
RE
114 Physical sciences
116 Chemical sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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