The high-flux effect on deuterium retention in TiC and TaC doped tungsten at high temperatures

M. Zibrov (Corresponding author), K. Bystrov, M. Mayer, T.W. Morgan, H. Kurishita

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Abstract

Samples made of tungsten (W) doped either with titanium carbide (W-1.1TiC) or tantalum carbide (W-3.3TaC) were exposed to a low-energy (40 eV/D), high-flux (1.8–5 × 1023 D/m2s) deuterium (D) plasma at temperatures of about800 K, 1050 K, and 1250 K to a fluence of about1 × 1027 D/m2. The deuterium (D) inventory in the samples was examined by nuclear reaction analysis and thermal desorption spectroscopy. At 800 K the D bulk concentrations and total D inventories in W-1.1TiC and W-3.3TaC were more than one order of magnitude higher compared to that in pure polycrystalline W. At 1050 K and 1250 K the D concentrations in all types of samples were very low (≤10−5 at. fr.); however the D inventories in W-1.1TiC were significantly higher compared to those in W-3.3TaC and pure W. It is suggested that D trapping inside the carbide precipitates and at their boundaries is essential at high temperatures and high incident fluxes, especially in W-1.1TiC.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalJournal of Nuclear Materials
Volume494
DOIs
Publication statusPublished - 1 Oct 2017
Externally publishedYes

Keywords

  • Blistering
  • Deuterium retention
  • Surface modifications
  • Thermal desorption
  • Tungsten

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