Journal
FUSION ENGINEERING AND DESIGN
Volume 125, Issue -, Pages 463-467Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2017.04.014
Keywords
Ion irradiation; He/H synergistic effect; Tungsten; Bubbles
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Funding
- National Natural Science Foundation of China [11275140]
- Natural Science Foundation of Jiangxi Province, China [20161BAB211030]
- Natural Science Foundation of Jiangxi Academy of Sciences [2015-XTPH1-09, 2015-YYB-09]
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Bubbles induced by single-ion (He or H) and sequential-ion (H/He or He/H) irradiation in tungsten were investigated using transmission electron microscopy (TEM). Specimens were irradiated with 12 keV He+ and 6.7 keV H+ under different fluences at 600 degrees C. Bubbles were observed after single He+ irradiation. And then bubbles grew larger with the increasing of the fluence of post-irradiated H+ under sequential He/H condition. Post-implanted H+ might make bubbles grow larger. For sequential H/He conditions, the size of bubbles changed little while the number density of bubbles grew significantly compared with single He+ irradiation condition. Pre-implanted H+ might enhance bubbles nucleated. The size of bubbles was smaller while the density was larger compared with sequential He/H irradiation condition at the same fluence. Possible explanations were discussed in this paper. (C) 2017 Elsevier B.V. All rights reserved.
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