Effect of tungsten and carbon surface mixed layer on deuterium permeation in tungsten

Deuterium ion-driven permeation in tungsten under mixed deuterium and carbon irradiation at 1keV was studied to investigate the incident flux dependency on deuterium permeation. Permeation experiments were performed at three temperatures (Tw=610K, 710K, 850K) under incident flux of 1019–1020m−2s−1....

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Bibliographic Details
Published inJournal of nuclear materials Vol. 438; pp. S1063 - S1066
Main Authors Peng, H.Y., Lee, H.T., Ohtsuka, Y., Ueda, Y.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2013
Subjects
Carbon
Deuterium
Diffusivity
Flux
Irradiation
Penetration
Permeation
Tungsten
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Summary:Deuterium ion-driven permeation in tungsten under mixed deuterium and carbon irradiation at 1keV was studied to investigate the incident flux dependency on deuterium permeation. Permeation experiments were performed at three temperatures (Tw=610K, 710K, 850K) under incident flux of 1019–1020m−2s−1. The variation of incident flux leads to similar temperature-dependent increase in steady-state deuterium permeation flux under mixed deuterium and carbon irradiation as observed in previous study. It is also found that the rise in permeation at high temperature larger than 800K cannot be explained by changes in front diffusivity of W–C mixed layer. Also, the incident flux dependency in deuterium permeation cannot be explained only by the hydrogen transport theory of Doyle and Brice. It is deducted that a mixed deuterium and carbon irradiation could cause an oversaturation state of deuterium in tungsten at temperature lower than 700K.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.01.233