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Dislocation loop formation by swift heavy ion irradiation of metals

Khara, GS; Murphy, ST; Duffy, DM; (2017) Dislocation loop formation by swift heavy ion irradiation of metals. Journal of Physics: Condensed Matter , 29 (28) , Article 285303. 10.1088/1361-648X/aa74f8. Green open access

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Abstract

A coupled two-temperature, molecular dynamics methodology is used to simulate the structural evolution of bcc metals (Fe and W) and fcc metals (Cu and Ni) following irradiation by swift heavy ions. Electronic temperature dependent electronic specific heat capacities and electron–phonon coupling strengths are used to capture the full effects of the variation in the electronic density of states. Tungsten is found to be significantly more resistant to damage than iron, due both to the higher melting temperature and the higher thermal conductivity. Very interesting defect structures, quite different from defects formed in cascades, are found to be created by swift heavy ion irradiation in the bcc metals. Isolated vacancies form a halo around elongated interstitial dislocation loops that are oriented along the ion path. Such configurations are formed by rapid recrystallization of the molten cylindrical region that is created by the energetic ion. Vacancies are created at the recrystallization front, resulting in excess atoms at the core which form interstitial dislocation loops on completion of crystallization. These unique defect structures could, potentially, be used to create metal films with superior mechanical properties and interesting nanostructures.

Type: Article
Title: Dislocation loop formation by swift heavy ion irradiation of metals
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1361-648X/aa74f8
Publisher version: http://doi.org/10.1088/1361-648X/aa74f8
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, swift heavy ions, dislocation loops, ion tracks, tungsten, iron, electron-phonon coupling, two temperature molecular dynamics, HIGH ELECTRONIC EXCITATIONS, RADIATION-DAMAGE, TRACK FORMATION, MEV FULLERENES, PURE METALS, IRON, TEMPERATURE, INSULATORS, GERMANIUM, SILICON
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 Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/1563641
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