Characterizing the recovery of a solid surface after tungsten nano-tendril formation

TitleCharacterizing the recovery of a solid surface after tungsten nano-tendril formation
Publication TypeJournal Article
Year of Publication2015
AuthorsG.M Wright, G.G van Eden, L.A Kesler, G. De Temmerman, D.G Whyte, K.B. Woller
JournalJournal of Nuclear Materials
Volume463
IssueAug
Pagination294 - 298
Abstract

Recovery of a flat tungsten surface from a nano-tendril surface is attempted through three techniques; a mechanical wipe, a 1673 K annealing, and laser-induced thermal transients. Results were determined through SEM imaging and elastic recoil detection to assess the helium content in the surface. The mechanical wipe leaves a ∼0.5 μm deep layer of nano-tendrils on the surface post-wipe regardless of the initial nano-tendril layer depth. Laser-induced thermal transients only significantly impact the surface morphology at heat loads of 35.2 MJ/m2 s1/2 or above, however a fully flat or recovered surface was not achieved for 100 transients at this heat load despite reducing the helium content by a factor of ∼7. A 1673 K annealing removes all detectable levels of helium but sub-surface voids/bubbles remain intact. The surface is recovered to a nearly flat state with only some remnants of nano-tendrils re-integrating into the surface remaining.

DOI10.1016/j.jnucmat.2014.11.083
Division

PSI

Department

PSI-E

PIDc1c027c487c5182e4706338f1facd768
Alternate TitleJ. Nucl. Mater.
LabelOA
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