期刊
APPLIED PHYSICS LETTERS
卷 102, 期 25, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4811825
关键词
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资金
- Culham Centre for Fusion Energy
- EPSRC [EP/H018921/1, EP/G004676/1, EP/F004451/1]
- EPSRC [EP/D032210/1, EP/H018921/1, EP/F004451/1, EP/G004676/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F004451/1, EP/H018921/1, 1104521, EP/D032210/1, EP/G004676/1] Funding Source: researchfish
To simulate neutron and helium damage in a fusion reactor first wall sequential self-ion implantation up to 13 dpa followed by helium-ion implantation up to 3000 appm was performed to produce damaged layers of similar to 2 mu m depth in pure tungsten. The hardness of these layers was measured using nanoindentation and was studied using transmission electron microscopy. Substantial hardness increases were seen in helium implanted regions, with smaller hardness increases in regions which had already been self-ion implanted, thus, containing pre-existing dislocation loops. This suggests that, for the same helium content, helium trapped in distributed vacancies gives stronger hardening than helium trapped in vacancies condensed into dislocation loops. (C) 2013 AIP Publishing LLC.
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