TEM observation of bubbles induced by single and sequential He/H irradiation in tungsten

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 12keV He+ and 6.7keV H+ under different fluences at 600°C. Bubbles were observed after single He+ irradiati...

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Bibliographic Details
Published in:Fusion engineering and design 2017-12, Vol.125, p.463-467
Main Authors: Luo, Fengfeng, Guo, Liping, Lu, Deping, Wang, Jiawei, Zheng, Zhongcheng, Zhang, Weiping, Shen, Zhenyu
Format: Article
Language:English
Subjects:
Bubbles
Fluence
He/H synergistic effect
Helium
Ion irradiation
Irradiation
Radiation
Studies
Transmission electron microscopy
Tungsten
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Summary: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 12keV He+ and 6.7keV H+ under different fluences at 600°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.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.04.014