Irradiation Damage Independent Deuterium Retention in WMoTaNbV

Anna Liski (Corresponding Author), Tomi Vuoriheimo, Pasi Jalkanen, Kenichiro Mizohata, Eryang Lu, Jari Likonen, Jouni Heino, Kalle Heinola, Yevhen Zayachuk, Anna Widdowson, Ko-Kai Tseng, Che-Wei Tsai, Jien-Wei Yeh, Filip Tuomisto, Tommy Ahlgren

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Abstract

High entropy alloys are a promising new class of metal alloys with outstanding radiation resistance and thermal stability. The interaction with hydrogen might, however, have desired (H storage) or undesired effects, such as hydrogen-induced embrittlement or tritium retention in the fusion reactor wall. High entropy alloy WMoTaNbV and bulk W samples were used to study the quantity of irradiation-induced trapping sites and properties of D retention by employing thermal desorption spectrometry, secondary ion mass spectrometry, and elastic recoil detection analysis. The D implantation was not found to create additional hydrogen traps in WMoTaNbV as it does in W, while 90 at% of implanted D is retained in WMoTaNbV, in contrast to 35 at% in W. Implantation created damage predicted by SRIM is 0.24 dpa in WMoTaNbV, calculated with a density of 6.044×1022 atoms/cm3. The depth of the maximum damage was 90 nm. An effective trapping energy for D in WMoTaNbV was found to be about 1.7 eV, and the D emission temperature was close to 700 °C.
Original languageEnglish
Article number 7296
JournalMaterials
Volume15
Issue number20
DOIs
Publication statusPublished - 19 Oct 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • deuterium
  • elastic recoil
  • fusion
  • high entropy alloy
  • hydrogen
  • metals
  • secondary ion
  • thermal desorption

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