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Title: Cavity evolution at grain boundaries as a function of radiation damage and thermal conditions in nanocrystalline nickel

Enhanced radiation tolerance of nanostructured metals is attributed to the high density of interfaces that can absorb radiation-induced defects. Here, cavity evolution mechanisms during cascade damage, helium implantation, and annealing of nanocrystalline nickel are characterized via in situ transmission electron microscopy (TEM). Films subjected to self-ion irradiation followed by helium implantation developed evenly distributed cavity structures, whereas films exposed in the reversed order developed cavities preferentially distributed along grain boundaries. Post-irradiation annealing and orientation mapping demonstrated uniform cavity growth in the nanocrystalline structure, and cavities spanning multiple grains. Furthermore, these mechanisms suggest limited ability to reduce swelling, despite the stability of the nanostructure.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [5]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Northwestern Univ., Evanston, IL (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Georgia Tech CNRS, Metz (France)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  6. Northwestern Univ., Evanston, IL (United States); Tufts Univ., Medford, MA (United States)
Publication Date:
Report Number(s):
SAND-2016-12418J
Journal ID: ISSN 2166-3831; 650382
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Materials Research Letters
Additional Journal Information:
Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 2166-3831
Publisher:
Taylor and Francis
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; In situ TEM; radiation; helium implantation; cavity evolution; nanocrystalline nickel
OSTI Identifier:
1343266