Abstract
Displacement cascades in iron have been generated using a BCA code with PKA energies ranging from 5 to 100 keV as input for modelling long term evolution using an OKMC code. The size distributions of the fractions of vacancy and interstitial clustered in the long-term are not significantly dependent on the PKA energy in this range. Since subcascade formation, morphology and spatial extension, as well as the spatial correlations between point-defect positions, depend on PKA energy, the size distributions of clustered point-defect fractions in the long-term do not depend on these cascade features. In contrast, the size distributions of clustered point-defect fractions in displacement cascades are independent of the PKA energy while their spatial correlations strongly influence the cluster size distributions in the long-term. The use of a mean-field approximation in cluster kinetics predictions is thereby invalidated. Irradiation dose and dose-rate are also found to be factors governing long-term evolution.
Details
Original language | English |
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Pages (from-to) | 103-111 |
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Journal | Journal of Nuclear Materials |
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Volume | 382 |
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Issue number | 2-3 |
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DOIs | |
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Publication status | Published - Nov 2008 |
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Event | Symposium on Microstructural Processes in Irradiated Materials - TMS Annual Meeting & Exhibition 2007 - Orlando, FL, United States Duration: 25 Feb 2007 → 1 Mar 2007 |
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