Cascade overlap with vacancy-type defects in Fe

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http://hdl.handle.net/10138/303998

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Granberg , F , Byggmästar , J & Nordlund , K 2019 , ' Cascade overlap with vacancy-type defects in Fe ' , European Physical Journal B. Condensed Matter and Complex Systems , vol. 92 , no. 7 , 146 . https://doi.org/10.1140/epjb/e2019-100240-3

Title: Cascade overlap with vacancy-type defects in Fe
Author: Granberg, Fredric; Byggmästar, Jesper; Nordlund, Kai
Contributor: University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
Date: 2019-07-03
Language: eng
Number of pages: 7
Belongs to series: European Physical Journal B. Condensed Matter and Complex Systems
ISSN: 1434-6028
URI: http://hdl.handle.net/10138/303998
Abstract: In order to understand the effect of irradiation on the material properties, we need to look into the atomistic evolution of the system during the recoil event. The nanoscale features formed due to irradiation will ultimately affect the macroscopic properties of the material. The defect production in pristine materials have been subject to investigation previously, but as the dose increases, overlap will start to happen. This effect of cascades overlapping with pre-existing debris has only recently been touched, and mainly been investigated for interstitial-type defects. We focus on vacancy-type defect clusters in BCC Fe and start a recoil event in their near vicinity. The final defect number as well as the transformation of the defect clusters are investigated, and their behaviour is related to the distance between the defect and the cascade centre. We found that for vacancy-type defects, the suppression of defect production is not as strong as previously observed for interstitial-type defects. The cascade-induced transformation, such as change in Burgers vector or creation of dislocations, was determined for all initial defect structures.
Subject: ALPHA-FE
CARBIDES
DISLOCATION LOOPS
DISPLACEMENT CASCADES
HEAVY-ION DAMAGE
IRRADIATION
MOLECULAR-DYNAMICS
SIMULATION
TEMPERATURE
TRANSITION
114 Physical sciences
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