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Title: Characterisation of radiation damage in W and W-based alloys from 2MeV self-ion near-bulk implantations

The displacement damage induced in bulk W and W-5 wt.% Re and W-5 wt.% Ta alloys by 2 MeV W + irradiation to doses 3.3×10 17 - 2.5×10 19 W +/m 2 at temperatures ranging from 300 to750°C has been characterized by transmission electron microscopy. An automated sizing and counting approach based on Image J has been proposed and performed for all irradiation data. In all cases the damage comprised dislocation loops, mostly of interstitial type, with Burgers vectors b = ½<111> (> 60%) and b = <100>. The diameters of loops did not exceed 20 nm, with the majority being ≤ 6 nm. The loop number density varied between 10 22 and 10 23 loops/m 3 . With increasing irradiation temperature, the loop size distributions shifted towards larger sizes, and there was a substantial decrease in loop number densities. The damage microstructure was less sensitive to dose than to temperature. Under the same irradiation conditions, loop number densities in the alloys were higher than in pure W but loops were smaller. In grains with normals close to z = <001>, loop strings developed in W at temperatures ≥ 500°C and doses ≥ 1.2 dpa, but such strings were notmore » observed in the W-Re or W-Ta alloys. However, in other grain orientations complex structures appeared in all materials and dense dislocation networks formed at higher doses.« less
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [2]
  1. Univ. of Oxford (United Kingdom). Dept. of Materials
  2. (United Kingdom). Culham Centre for Fusion Energy (CCFE)
  3. Univ. of Oxford (United Kingdom). Trinity College
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1359-6454; 547696
Grant/Contract Number:
AC04-94AL85000; AC05-00OR22725; EP/H018921/1
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 92; Journal Issue: C; Journal ID: ISSN 1359-6454
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Orgs:
Univ. of Oxford (United Kingdom)
Country of Publication:
United States
36 MATERIALS SCIENCE; W/W-alloys; Ion irradiation; Electron microscopy; Damage microstructure
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1261438