| Autor: |
Zarkadoula E; Queen Mary University of London, London, UK. e.zarkadoula@qmul.ac.uk, Daraszewicz SL, Duffy DM, Seaton MA, Todorov IT, Nordlund K, Dove MT, Trachenko K |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2013 Mar 27; Vol. 25 (12), pp. 125402. Date of Electronic Publication: 2013 Feb 28. |
| DOI: |
10.1088/0953-8984/25/12/125402 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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