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Title: Fragmentation of displacement cascades into subcascades: A molecular dynamics study

The fragmentation of displacement cascades into subcascades in copper and iron has been investigated through the molecular dynamics technique. A two-point density correlation function has been used to analyze the cascades as a function of the primary knock-on (PKA) energy. This approach is used as a tool for detecting subcascade formation. The fragmentation can already be identified at the end of the ballistic phase. Its resulting evolution in the peak damage state discriminates between unconnected and connected subcascades. The damage zone at the end of the ballistic phase is the precursor of the extended regions that contain the surviving defects. A fractal analysis of the cascade exhibits a dependence on both the stage of the cascade development and the PKA energy. This type of analysis enables the minimum and maximum displacement spike energies together with the subcascade formation threshold energy to be determined. (C) 2014 Elsevier B.V. All rights reserved.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4]
  1. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
  2. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France); Centre National de la Recherche Scientifique (CNRS), Malabry (France)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Ecole Polytechnique Federale Palaiseau (France). Lab of Irradiated Solids
Publication Date:
OSTI Identifier:
1336576
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 458; Journal Issue: C; Journal ID: ISSN 0022-3115
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English