2016年1月
Defect structures of F82H irradiated at SINQ using positron annihilation spectroscopy
JOURNAL OF NUCLEAR MATERIALS
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- 巻
- 468
- 号
- 開始ページ
- 281
- 終了ページ
- 284
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jnucmat.2015.03.055
- 出版者・発行元
- ELSEVIER SCIENCE BV
The growth process of He-filled vacancy clusters during annealing was investigated with positron annihilation lifetime spectroscopy and coincidence Doppler broadening (CDB) measurements. The reduced activation ferritic/martensitic steel F82H was irradiated with high-energy protons and spallation neutrons. The He-filled vacancy clusters absorbed more He atoms when annealed below 673 K, and the long and mean positron lifetimes decreased. When annealed above 873 K, the vacancies (V)-He-m or V-n-He-m complexes dissociated (n and m are the number of vacancies and He atoms, respectively). The He-filled vacancy clusters then absorb these dissociated vacancies and He atoms. Therefore, the size of the He-filled vacancy clusters increased, and the He-to-vacancy ratio decreased. These annealing-induced phenomena increased the long positron lifetime in addition to the higher positron trapping rates of the He-filled vacancy clusters. By comparing electron-irradiated samples that did not contain He atoms to the proton- and neutron-irradiated samples containing He atoms, the effects of He atoms on the CDB ratio curves were studied. The results agreed with the previous study of He-ion-implanted Fe-Cr alloys. (c) 2015 Elsevier B.V. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jnucmat.2015.03.055
- ISSN : 0022-3115
- eISSN : 1873-4820
- Web of Science ID : WOS:000367761700035