University of the Ryukyus · Faculty of Education · 教授

Research keywordshydrogen embrittlement・ferritic-martensitic steel・density functional theory・vacancy-hydrogen complexes・positron annihilation・silicon carbide composites

This is a public-data preview. Personalized fit, contact angles, and saved workflows require sign-in.

• Effect of uniaxial tensile strain on binding energy of hydrogen atoms to vacancy-carbon-hydrogen complexes in α-iron2022 · Hirayama S.
• Interaction of primary precipitates in reduced -activation ferritic/martensitic steel F82H with hydrogen atoms: Atomistic calculation based on the density functional theory2022 · Iwakiri H.
• Change in the Positron Annihilation Lifetime of Vacancy Clusters Containing Hydrogen Atoms in Electron-Irradiated F82H2021 · <jats:p>The change in the positron annihilation lifetime (PAL) of vacancy clusters before and after electrolysis hydrogen charging was determined using PAL measurements in electron-irradiated F82H. The experimental change indicated 8 hydrogen atoms were trapped in vacancy clusters; whereas the theoretical calculation resulted in approximately 14 atoms. As the samples were left at room temperature for 5 min until the start of the PAL measurements, the de-trapping effect of hydrogen atoms was also considered; approximately 13 hydrogen atoms were captured at each vacancy cluster. The PAL decreased after annealing at 148 K, which could not be explained theoretically. Therefore, further experiments and discussions are needed to obtain a precise change in the PAL of vacancy clusters containing hydrogen atoms in F82H.</jats:p>
• Hydrogen retention behavior of primary precipitates in F82H steel: Atomistic calculation based on the density functional theory2020 · Watanabe Y.

• 中高理科教育に「プラズマ」は導入できるのか？その有用性を見極める実践的研究2016 · 基盤研究(C)
• 照射相関の解明に向けた照射下材料ミクロ構造変化のモデル化に関する研究2013 · ■■■

• Official profile