期刊
SCRIPTA MATERIALIA
卷 178, 期 -, 页码 256-260出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.11.039
关键词
Tungsten; Helium ion irradiation; Surface blistering; Inert gas nanobubbles; Helium ion microscopy
类别
资金
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- NSF DMR [1807822]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1807822] Funding Source: National Science Foundation
Helium-ion-induced swelling and blistering of single-crystal tungsten is investigated using a Helium Ion Microscope for site-specific dose-controlled irradiation (at 25 keV) with analysis by Helium Ion Microscopy, Atomic Force Microscopy and Transmission Electron Microscopy (cross-sectioning by Focused Ion Beam milling). We show that the blister cavity forms at a depth close to the simulated helium peak and that nanobubbles coalesce to form nanocracks within the envelope of the ion stopping range, swelling the blister shell. These results provide the first direct experimental evidence for the interbubble fracture mechanism proposed in the framework of the gas pressure model for blister formation. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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