|Title||Deuterium-induced nanostructure formation on tungsten exposed to high-flux plasma|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||H.Y. Xu, G. De Temmerman, G.N Luo, Y.Z Jia, Y. Yuan, B.Q Fu, A. Godfrey, W. Liu|
|Journal||Journal of Nuclear Materials|
|Pagination||308 - 311|
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.
|Alternate Title||J. Nucl. Mater.|
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