Dislocation-mediated trapping of deuterium in tungsten under high-flux high-temperature exposures

A. Bakaeva, D. Terentyev, G. De Temmerman, K. Lambrinou, T. W. Morgan, A. Dubinko, P. Grigorev, K. Verbeken, J. M. Noterdaeme

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effect of severe plastic deformation on the deuterium retention in tungsten exposed to high-flux low-energy plasma (flux ∼10 24  m −2  s −1 , energy ∼50 eV and fluence up to 5 × 10 25  D/m 2 ) was studied experimentally in a wide temperature range (460–1000 K) relevant for application in ITER. The desorption spectra in both reference and plastically-deformed samples were deconvoluted into three contributions associated with the detrapping from dislocations, deuterium-vacancy clusters and pores. As the exposure temperature increases, the positions of the release peaks in the plastically-deformed material remain in the same temperature range but the peak amplitudes are altered as compared to the reference material. The desorption peak attributed to the release from pores (i.e. cavities and bubbles) was suppressed in the plastically deformed samples for the low-temperature exposures, but became dominant for exposures above 700 K. The observed strong modulation of the deuterium storage in “shallow” and “deep” traps, as well as the reduction of the integral retention above 700 K, suggest that the dislocation network changes its role from “trapping sites” to “diffusion channels” above a certain temperature. The major experimental observations of the present work are in line with recent computational assessment based on atomistic and mean field theory calculations available in literature.

LanguageEnglish
Pages307-315
Number of pages9
JournalJournal of Nuclear Materials
Volume479
Early online date9 Jul 2016
DOIs
Publication statusPublished - Oct 2016
Externally publishedYes

Fingerprint

Tungsten
Deuterium
deuterium
tungsten
trapping
Fluxes
desorption
Desorption
porosity
Temperature
temperature
Mean field theory
plastic deformation
fluence
Dislocations (crystals)
bubbles
traps
Vacancies
Plastic deformation
modulation

Cite this

Bakaeva, A. ; Terentyev, D. ; De Temmerman, G. ; Lambrinou, K. ; Morgan, T. W. ; Dubinko, A. ; Grigorev, P. ; Verbeken, K. ; Noterdaeme, J. M. / Dislocation-mediated trapping of deuterium in tungsten under high-flux high-temperature exposures. In: Journal of Nuclear Materials. 2016 ; Vol. 479. pp. 307-315.
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Bakaeva, A, Terentyev, D, De Temmerman, G, Lambrinou, K, Morgan, TW, Dubinko, A, Grigorev, P, Verbeken, K & Noterdaeme, JM 2016, 'Dislocation-mediated trapping of deuterium in tungsten under high-flux high-temperature exposures', Journal of Nuclear Materials, vol. 479, pp. 307-315. https://doi.org/10.1016/j.jnucmat.2016.07.018

Dislocation-mediated trapping of deuterium in tungsten under high-flux high-temperature exposures. / Bakaeva, A.; Terentyev, D.; De Temmerman, G.; Lambrinou, K.; Morgan, T. W.; Dubinko, A.; Grigorev, P.; Verbeken, K.; Noterdaeme, J. M.

In: Journal of Nuclear Materials, Vol. 479, 10.2016, p. 307-315.

Research output: Contribution to journalArticle

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AU - Terentyev, D.

AU - De Temmerman, G.

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