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Title: Temperature dependence of underdense nanostructure formation in tungsten under helium irradiation

Recently, tungsten has been found to form a highly underdense nanostructured morphology (“W fuzz”) when bombarded by an intense flux of He ions, but only in the temperature window 900–2000 K. Furthermore, using object kinetic Monte Carlo simulations (pseudo-3D simulations) parameterized from first principles, we show that this temperature dependence can be understood based on He and point defect clustering, cluster growth, and detrapping reactions. At low temperatures (<900 K), fuzz does not grow because almost all He is trapped in very small He-vacancy clusters. At high temperatures (>2300 K), all He is detrapped from clusters, preventing the formation of the large clusters that lead to fuzz growth in the intermediate temperature range.
Authors:
 [1] ;  [2] ;  [3] ; ORCiD logo [4] ;  [5] ;  [5] ;  [1] ;  [1]
  1. Univ. Politecnica de Madrid, Madrid (Spain)
  2. Univ. Catolica de Murcia, Murcia (Spain)
  3. Univ. of Helsinki, Helsinki (Finland); National Research Nuclear Univ. MEPhI, Moscow (Russia)
  4. Univ. of Helsinki, Helsinki (Finland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Helsinki, Helsinki (Finland)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 490; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; Tungsten; Helium irradiation; Fuzz nanostructures; OKMC simulations; Temperature
OSTI Identifier:
1376343