Relevancy of displacement cascades features to the long term point defect cluster growth

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  • Marc Hou
  • Abdelkader Souidi
  • Charlotte Becquart
  • Christophe Domain
  • Lorenzo Malerba

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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.


Original languageEnglish
Pages (from-to)103-111
JournalJournal of Nuclear Materials
Issue number2-3
Publication statusPublished - Nov 2008
EventSymposium on Microstructural Processes in Irradiated Materials - TMS Annual Meeting & Exhibition 2007 - Orlando, FL, United States
Duration: 25 Feb 20071 Mar 2007


  • displacement cascades, cluster growth, kinetic Monte Carlo simulations

ID: 67666