Nanoscale surface morphology of tungsten materials induced by Be-seeded D-He plasma exposure

K. Tokunaga, M. J. Baldwin, R. P. Doerner, D. Nishijima, H. Kurishita, T. Fujiwara, K. Araki, Y. Miyamoto, N. Ohno, Y. Ueda

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Ultra-fine grain W-(0.5, 1.5)wt%TiC alloys and stress relieved powder metallurgy W have been exposed to D-He mixed plasmas, some with added Be. The fixed exposure conditions are ion energy 60 eV and flux 3 to 6 × 10 22/m2 s. Sample temperature is 1123 K and exposure times scanned 1000-11,000 s. Typical He/D ion is 0.2 and Be is 0.2% of the plasma. A remarkable change of the tungsten surfaces results from the plasma exposures. Formation of a nano-structured layer on the exposure surfaces is observed and believed to be related to He bubble formation. In addition, the growth rate of the nano-structured layer depends on the microstructure of the samples. In the case of a D-He plasma with Be, at 60 eV, plasma sputters away most of Be deposits with little effect on the He induced nano-structured layer formation.

Original languageEnglish
Pages (from-to)528-532
Number of pages5
JournalJournal of Nuclear Materials
Issue number1-3
Publication statusPublished - Oct 1 2011

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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