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Kim, B. K.*; Tan, L.*; 酒瀬川 英雄; Parish, C. M.*; Zhong, W.*; 谷川 博康*; 加藤 雄大*
Journal of Nuclear Materials, 545, p.152634_1 - 152634_12, 2021/03
被引用回数:1 パーセンタイル:15.09(Materials Science, Multidisciplinary)Understanding the effects of helium on microstructures and mechanical properties of reduced-activation ferritic-martensitic steels is important to use of these steels in fusion reactor structures. 9Cr-2WVTa steels were doped with Ni and Ni isotopes at 2 weight percent to control the rate of transmutation helium generation. The samples were irradiated in the High Flux Isotope Reactor. Transmission electron microscopy revealed a variety of precipitates and the radiation-induced dislocation loops and cavities (voids or helium bubbles). Tensile tests of the irradiated samples at the irradiation temperatures showed radiation-hardening at 300C and radiation-softening at 400C. Analysis indicates that the hardening primarily originated from the loops and cavities. The Ni-doped samples had greater strengthening contributions from loops and cavities, leading to higher hardening with lower ductility than the Ni-doped samples. The greater helium production of Ni did not show pronounced reductions in ductility of the samples.
Parish, T. A.*; Charlton, W. S.*; 篠原 伸夫; 安藤 真樹; Brady, M. C.*; Raman, S.*
Nuclear Science and Engineering, 131(2), p.208 - 221, 1999/02
被引用回数:8 パーセンタイル:53.51(Nuclear Science & Technology)本論文は、遅発中性子データを評価するAmerican Nuclear Society Standards Committee Subgroup(ANS19.9)において進められた研究の成果をまとめたものである。テキサスA&M大学において近年測定された遅発中性子放出率についても述べられている。測定データと核分裂生成物の収率データに基づく計算とを比較し、核データの妥当性を検証した。その結果、ENDF/B-VIデータライブラリーの6群構造遅発中性子データは修正の必要があることがわかった。また、Keepinが提唱した6群構造のうちの第2群をI-137とBr-88及びTe-136とに分けた詳細な構造の有用性が確かめられた。