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Fragmentation of displacement cascades into subcascades: A molecular dynamics study

Journal Article · · Journal of Nuclear Materials
 [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
+ Show Author Affiliations
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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1336576
Alternate ID(s):
OSTI ID: 22457403
OSTI ID: 1252372
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 458; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Fractal analysis of collision cascades in pulsed-ion-beam-irradiated solids journal December 2017
Approach to local thermodynamic equilibrium and the evolution to a glassy core following neutron/ion radiation impact journal August 2018

Figures / Tables (11)

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