Characterisation of radiation damage in W and W-based alloys from 2MeV self-ion near-bulk implantations
- Univ. of Oxford (United Kingdom). Dept. of Materials; Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
- Univ. of Oxford (United Kingdom). Trinity College
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
We report that the displacement damage induced in W and W-5 wt.% Re and W-5 wt.% Ta alloys by 2 MeV W+ irradiation to doses 3.3 x 1017 - 2.5 x 1019 W+/m2 at temperatures ranging from 300 to 750 °C has been characterised by transmission electron microscopy. An automated sizing and counting approach based on Image J (a Java-based image processing programme developed at the National Institutes of Health) [1] has been performed for all near-bulk irradiation data. In all cases the damage comprised dislocation loops, mostly of interstitial type, with Burgers vectors b = 1/2 < 111 > (>60%) and b = (1 00). The diameters of loops did not exceed 20 nm with most being ≤ = 6 nm diameter. The loop number density varied between 1022 and 1023 loops/m3. 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 W-Re and W-Ta alloys were higher than in pure W but loops were smaller. In grains with normals close to z = < 001 >, loop strings developed in pure W at temperatures ≥ = 500 °C and doses ≥= 1.2 dpa, but such strings were not 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.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
- Contributing Organization:
- Univ. of Oxford (United Kingdom)
- Grant/Contract Number:
- AC04-94AL85000; AC05-00OR22725; EP/H018921/1
- OSTI ID:
- 1184999
- Alternate ID(s):
- OSTI ID: 1261438; OSTI ID: 1432125
- Report Number(s):
- SAND-2014-20338J; 547696
- Journal Information:
- Acta Materialia, Vol. 92, Issue C; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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