Deuterium-induced nanostructure formation on tungsten exposed to high-flux plasma

TitleDeuterium-induced nanostructure formation on tungsten exposed to high-flux plasma
Publication TypeJournal Article
Year of Publication2015
AuthorsH.Y. Xu, G. De Temmerman, G.N Luo, Y.Z Jia, Y. Yuan, B.Q Fu, A. Godfrey, W. Liu
JournalJournal of Nuclear Materials
Volume463
IssueAug
Pagination308 - 311
Abstract

Surface topography of polycrystalline tungsten (W) have been examined after exposure to a low-energy (38 eV/D), high-flux (∼1.1–1.5 × 1024 m−2 s−1) deuterium plasma in the Pilot-PSI linear plasma device. The methods used were scanning electron microscopy (SEM), transmission electron microscopy (TEM), positron annihilation Doppler broadening (PADB) and grazing incident X-ray diffraction (GI-XRD). After exposure to high flux D plasma, blisters and nanostructures are formed on the W surface. Generation of defects was evidenced by PADB, while high stress and mixture of phases were detected in depth of 50 nm by GI-XRD. TEM observation revealed fluctuations and disordered microstructure on the outmost surface layer. Based on these results, surface reconstruction is considered as a possible mechanism for the formation of defects and nanostructures.

DOI10.1016/j.jnucmat.2014.11.039
Division

PSI

Department

PSI-E

PID

96cfba8d81e072fe50b88e3d14b37885

Alternate TitleJ. Nucl. Mater.

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