Grain orientations and grain boundaries in tungsten nonotendril fuzz grown under divertor-like conditions

Parish, Chad M.; Wang, Kun; Doerner, Russel P.; Baldwin, Matthew J.

doi:10.1016/j.scriptamat.2016.09.018

Grain orientations and grain boundaries in tungsten nonotendril fuzz grown under divertor-like conditions

Journal Article · Mon Sep 19 00:00:00 EDT 2016 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2016.09.018· OSTI ID:1326512

Parish, Chad M. ^[1]; Wang, Kun ^[1]; Doerner, Russel P. ^[2]; Baldwin, Matthew J. ^[2]

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

We grew nanotendril “fuzz” on tungsten via plasma exposure and performed transmission Kikuchi diffraction (tKD) in scanning electron microscopy of isolated nanotendrils. 900 °C, 10²³ He/m²sec, 4 × 10²⁶ He/m² exposure of tungsten produced a deep and fully developed nanotendril mat. tKD of isolated nanotendrils indicated that there was no preferred crystallographic direction oriented along the long axes of the tendrils, and the grain boundary character showed slightly preferential orientations. In conclusion, tendril growth is sufficiently non-equilibrium to prevent any preference of growth direction to manifest measurably, and that new high-angle boundaries (with new grains and grain-growth axes) nucleate randomly along the tendrils during growth.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; FG02-07ER54912

OSTI ID:: 1326512

Alternate ID(s):: OSTI ID: 1397958

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: C Vol. 127; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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