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The nature of high-energy radiation damage in iron.

Zarkadoula, E; Daraszewicz, SL; Duffy, DM; Seaton, MA; Todorov, IT; Nordlund, K; Dove, MT; (2013) The nature of high-energy radiation damage in iron. Journal of Physics: Condensed Matter , 25 (12) , Article 125402. 10.1088/0953-8984/25/12/125402. Green open access

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Abstract

Understanding and predicting a material's performance in response to high-energy radiation damage, as well as designing future materials to be used in intense radiation environments, requires knowledge of the structure, morphology and amount of radiation-induced structural changes. We report the results of molecular dynamics simulations of high-energy radiation damage in iron in the range 0.2-0.5 MeV. We analyze and quantify the nature of collision cascades both at the global and the local scale. We observe three distinct types of damage production and relaxation, including reversible deformation around the cascade due to elastic expansion, irreversible structural damage due to ballistic displacements and smaller reversible deformation due to the shock wave. We find that the structure of high-energy collision cascades becomes increasingly continuous as opposed to showing sub-cascade branching as reported previously. At the local length scale, we find large defect clusters and novel small vacancy and interstitial clusters. These features form the basis for physical models aimed at understanding the effects of high-energy radiation damage in structural materials.

Type: Article
Title: The nature of high-energy radiation damage in iron.
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0953-8984/25/12/125402
Publisher version: http://dx.doi.org/10.1088/0953-8984/25/12/125402
Language: English
Additional information: Copyright 2013 IOP Publishing Ltd
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1390222
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