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タイトル: | Detection of phase separation of neutron-irradiated Fe–Cr binary alloys using positron annihilation spectroscopy |
著者: | Noshita, Y. Sato, K. Yamashita, H. Kasada, R. Xu, Q. Hatakeyama, M. Sunada, S. |
著者名の別形: | 徐, 虬 |
キーワード: | Fe–Cr binary alloys Neutron irradiation Positron annihilation Hardness Phase separation |
発行日: | May-2018 |
出版者: | Elsevier BV |
誌名: | Nuclear Materials and Energy |
巻: | 15 |
開始ページ: | 175 |
終了ページ: | 179 |
抄録: | Phase separation in Fe–Cr binary alloys irradiated with neutrons at 473 K and 573 K was investigated using positron annihilation spectroscopy. Using positron annihilation coincidence Doppler broadening (CDB) measurements, the phase separation progress was observed in neutron-irradiated samples at 473 K and 573 K. Vacancy clusters were detected in Fe–xCr (x = 0, 9, 15, 30, 45, 50, and 100) during 473 K irradiation using positron annihilation lifetime measurements, but were not detected in Fe–xCr (x = 70, 85, and 91) irradiated at 473 K or in any samples irradiated at 573 K. Additionally, in Fe–xCr (x = 70, 85, and 91) irradiated at 473 K, all positrons were annihilated with core Fe electrons as determined from CDB ratio curves. Thus, vacancy clusters were not detected in the Fe-rich phase. There was a possibility that vacancy clusters are formed in the Cr-rich phase, but they were not detected by the PAS. Therefore, another method is necessary to investigate this further. Vickers hardness tests indicated that neutron-irradiated samples were harder than unirradiated samples. The contribution of phase separation and neutron-irradiation defects to increased hardness was dependent on the irradiation conditions including temperature and dose. |
著作権等: | © 2018 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). |
URI: | http://hdl.handle.net/2433/233864 |
DOI(出版社版): | 10.1016/j.nme.2018.04.007 |
出現コレクション: | 学術雑誌掲載論文等 |
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