The nanostructure evolution in Fe-C systems under irradiation at 560 K
| Autor: | Lorenzo Malerba, Monica Chiapetto, Ville Jansson |
|---|---|
| Přispěvatelé: | Department of Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Nuclear and High Energy Physics
Work (thermodynamics) Nanostructure education Binding energy FOS: Physical sciences Nanotechnology 02 engineering and technology Radiation 114 Physical sciences 01 natural sciences Condensed Matter::Materials Science Vacancy defect 0103 physical sciences General Materials Science Neutron Kinetic Monte Carlo Irradiation 010306 general physics Condensed Matter - Materials Science Chemistry Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Nuclear Energy and Engineering Chemical physics 0210 nano-technology |
| Popis: | This work extends our Object Kinetic Monte Carlo model for neutron irradiation-induced nanostructure evolution in Fe-C alloys to consider higher irradiation temperatures. The previous study concentrated on irradiation temperatures < 370 K. Here we study the evolution of vacancy and self-interstitial atom (SIA) cluster populations at the operational temperature of light water reactors, by simulating specific reference irradiation experiments. Following our previous study, the effect of carbon on radiation defect evolution can be described in terms of formation of immobile complexes with vacancies, that in turn act as traps for SIA clusters. This dynamics is simulated using generic traps for SIA and vacancy clusters. The traps have a binding energy that depends on the size and type of the clusters and is also chosen on the basis of previously performed atomistic studies. The model had to be adapted to account for the existence of two kinds of SIA clusters, and , as observed in electron microscopy examinations of Fe alloys neutron irradiated at the temperatures of technological interest. The model, which is fully based on physical considerations and only uses a few parameters for calibration, is found to be capable of reproducing the experimental trends, thereby providing insight into the physical mechanisms of importance to determine the type of nanostructural evolution undergone by the material during irradiation. |
| Databáze: | OpenAIRE |
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