Morphologies of tungsten nanotendrils grown under helium exposure

Wang, Kun; Doerner, R. P.; Baldwin, Matthew J.; Meyer, Fred W.; Bannister, Mark E.; Darbal, Amith; Stroud, Robert; Parish, Chad M.

doi:10.1038/srep42315

Morphologies of tungsten nanotendrils grown under helium exposure

Journal Article · Tue Feb 14 00:00:00 EST 2017 · Scientific Reports

DOI:https://doi.org/10.1038/srep42315· OSTI ID:1344265

Wang, Kun ^[1]; Doerner, R. P. ^[2]; Baldwin, Matthew J. ^[2]; Meyer, Fred W. ^[1]; Bannister, Mark E. ^[1]; Darbal, Amith ^[3]; Stroud, Robert ^[3]; Parish, Chad M. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California-San Diego, La Jolla, CA (United States)
AppFive, Tempe, AZ (United States)

Nanotendril “fuzz” will grow under He bombardment under tokamak-relevant conditions on tungsten plasma-facing materials in a magnetic fusion energy device. We have grown tungsten nanotendrils at low (50 eV) and high (12 keV) He bombardment energy, in the range 900–1000 °C, and characterized them using electron microscopy. Low energy tendrils are finer (~22 nm diameter) than high-energy tendrils (~176 nm diameter), and low-energy tendrils have a smoother surface than high-energy tendrils. Cavities were omnipresent and typically ~5–10 nm in size. Oxygen was present at tendril surfaces, but tendrils were all BCC tungsten metal. Electron diffraction measured tendril growth axes and grain boundary angle/axis pairs; no preferential growth axes or angle/axis pairs were observed, and low-energy fuzz grain boundaries tended to be high angle; high energy tendril grain boundaries were not observed. We speculate that the strong tendency to high-angle grain boundaries in the low-energy tendrils implies that as the tendrils twist or bend, strain must accumulate until nucleation of a grain boundary is favorable compared to further lattice rotation. Finally, the high-energy tendrils consisted of very large (>100 nm) grains compared to the tendril size, so the nature of the high energy irradiation must enable faster growth with less lattice rotation.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1344265

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 7; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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