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Indexed by:期刊论文

Date of Publication:2018-04-01

Journal:JOURNAL OF NUCLEAR MATERIALS

Included Journals:SCIE

Volume:501

Page Number:275-281

ISSN No.:0022-3115

Abstract:In this study, polycrystalline tungsten (W) and three oxide dispersed strengthened W with 0.1 vol %, 1.0 vol % and 5.0 vol % lanthanum trioxide (La2O3) were irradiated with low-energy (200 eV) and high-flux (5.8 x 10(21) or 1.4 x 10(22) ions/m(2).s) He+ ions at elevated temperature. After He+ irradiation at a fluence of 3.0 x 10(25)/m(2), their surface damages were observed by scanning electron microscopy, energy dispersive spectroscopy, scanning electron microscopy-electron backscatter diffraction, and conductive atomic force microscopy. Micron-sized holes were formed on the surface of W alloys after Hethorn irradiation at 1100 K. Analysis shows that the La2O3 grains doped in W were sputtered preferentially by the high-flux Hethorn ions when compared with the W grains. For irradiation at 1550 K, W nano-fuzz was formed at the surfaces of both polycrystalline W and La2O3-doped W. The thickness of the fuzz layers formed at the surface of La2O3-doped W is 40% lower than the one of polycrystalline W. The presence of La2O3 could suppress the diffusion and coalescence of He atoms inside W, which plays an important role in the growth of nanostructures fuzz. (C) 2018 Elsevier B.V. All rights reserved.