Effect of rhenium addition on deuterium retention in neutron-irradiated tungsten

The effects of rhenium (Re) addition on deuterium (D) retention in neutron-irradiated tungsten (W) were investigated. Pure W and W-5Re (5 at.%) alloy samples were irradiated with neutrons at High Flux Isotope Reactor using MFE-RB-19 J capsule. The sample temperature and the damage level were 864 K a...

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Bibliographic Details
Published in:Journal of nuclear materials 2022-08, Vol.566 (C), p.153774, Article 153774
Main Authors: Nobuta, Y., Toyama, T., Matsumoto, A., Shimada, M., Oya, Y., Inoue, K., Nagai, Y., Hatano, Y.
Format: Article
Language:English
Subjects:
Deuterium
Fluence
Hydrogen retention
Irradiation
Neutron irradiation
Neutrons
Plasma facing materials
Positron annihilation
Positron annihilation spectroscopy
Retention
Rhenium
Spectrometry
Spectroscopy
Thermal desorption spectrometry
Tritium
Tungsten
Tungsten-rhenium
Vacancies
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Summary:The effects of rhenium (Re) addition on deuterium (D) retention in neutron-irradiated tungsten (W) were investigated. Pure W and W-5Re (5 at.%) alloy samples were irradiated with neutrons at High Flux Isotope Reactor using MFE-RB-19 J capsule. The sample temperature and the damage level were 864 K and 0.35 dpa for pure W and 792 K and 0.26 dpa for W-5Re alloy. A portion of the samples was exposed to D plasma at Tritium Plasma Experiment at Idaho National Laboratory at 823 K to a fluence of 5 × 1025m−2. Vacancy-type defects in neutron-irradiated samples were examined using positron annihilation spectroscopy (PAS); D retention after plasma exposure was evaluated by thermal desorption spectrometry (TDS). TDS measurements revealed that D retention in the neutron-irradiated W-5Re alloy was similar to that in the unirradiated W sample, whereas a significant increase in D retention was observed in neutron-irradiated W. Thus, Re addition significantly suppressed the increase in D retention after neutron irradiation. This effect was attributed to the suppression of vacancy-type defect formation, as confirmed by PAS.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2022.153774