Journal
MATERIALS & DESIGN
Volume 160, Issue -, Pages 1226-1237Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.11.001
Keywords
Micro-diffraction; Helium-implantation; Tungsten-rhenium; Eigenstrain
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Funding
- Leverhulme Trust Research Project [RPG-2016-190]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- UK Engineering and Physical Sciences Research Council [EP/H018921/1]
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Tungsten is the main candidate material for plasma-facing armour components in future fusion reactors. Bombardment with energetic fusion neutrons causes collision cascade damage and defect formation. Interaction of defectswith helium, produced by transmutation and injected from the plasma, modifies defect retention and behaviour. Hereweinvestigate the residual lattice strains caused by different doses of helium-ion-implantation into tungsten and tungsten-rheniumalloys. Energy and depth-resolved synchrotron X-raymicro-diffraction uniquely permits the measurement of lattice strainwith sub-micron 3D spatial resolution and similar to 10(-4) strain sensitivity. Increase of helium dose from 300 appm to 3000 appm increases volumetric strain by only similar to 2.4 times, indicating that defect retention per injected helium is similar to 3 times higher at low helium doses. This suggests defect retention is not a simple function of implanted helium dose, but strongly depends on material composition and presence of impurities. Conversely, analysis of W-1 wt% Re alloy samples and of different crystal orientations shows that both the presence of rhenium, and crystal orientation, have a comparatively small effect on defect retention. These insights are key for the design of armour components in future reactors where it will be essential to account for irradiation-induced dimensional change when predicting component lifetime and performance. (c) 2018 Elsevier Ltd. All rights reserved.
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