Site Change of Hydrogen in Niobium on Alloying with Oversized Ta Atoms
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概要
- 論文の詳細を見る
In order to clarify a difference in hydrogen interaction with oversized solute atoms and with undersized solute atoms in bcc metals in the low solute concentration region, the site occupancy of hydrogen in Nb alloyed with 5 at. % of oversized Ta atoms has been studied at room temperature for hydrogen concentrations of 0.018 and 0.025 at the hydrogen-to-metal-atom ratio ($C_{\text{H}}=[\text{H}]/[\text{M}]$) by the channelling method utilizing a nuclear reaction 1H(11B,$\alpha$)$\alpha\alpha$ with a 11B beam of an energy of 2.03 MeV. Clearly different from the result on hydrogen in Nb alloyed with undersized Mo atoms, in both specimens H atoms are distributed over tetrahedral (T) sites and the displaced-T sites ($d$-T sites) which are displaced from T sites by about 0.25 Å towards their nearest neighbour octahedral (O) sites. The T site is more favourable for hydrogen occupancy, but the number of available T sites is limited, and excess H atoms occupy the $d$-T sites. Therefore, in contrast to a strong attractive interaction between hydrogen and undersized Mo atoms (trapping), there exists no such a strong attractive interaction between hydrogen and oversized Ta atoms. It is considered that the trapping of hydrogen by undersized solute atoms is effective to the large enhancement of the terminal solubility of hydrogen (TSH) on alloying with undersized solute atoms, at least, in the low solute concentration region.
- Physical Society of Japanの論文
- 2009-06-15
著者
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SHISHIDO Toetsu
Institute for Materials Research (IMR), Tohoku University
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Miyahara Kazuya
The School Of Science And Engineering Waseda University
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Koike Shigetoshi
Department Of Physics Faculty Of Science Science University Of Tokyo
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YAGI Eiichi
RIKEN (The Institute of Physical and Chemical Research), Nishina Centre
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Matsuba Hiroshi
The School Of Science And Engineering Waseda University
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Yoshii Motoyasu
The School Of Science And Engineering Waseda University
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Sugawara Takamasa
Institute For Materials Research (imr) Tohoku University
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Okada Yoshinori
The School Of Science And Engineering Waseda University
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Ogiwara Kiyoshi
Riken (the Institute Of Physical And Chemical Research)
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Miyahara Kazuya
The School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555
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Ogiwara Kiyoshi
RIKEN (The Institute of Physical and Chemical Research), Nishina Centre, Wako, Saitama 351-0198
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Matsuba Hiroshi
The School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555
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Yoshii Motoyasu
The School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555
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Sugawara Takamasa
Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577
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Shishido Toetsu
Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577
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Shishido Toetsu
Institute for Materials Reseach, Tohoku University, 2-1-1 Katahira-cho, Aoba-ku, Sendai 980-8577, Japan
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Koike Shigetoshi
Department of Physics II, Tokyo University of Science, Shinjuku, Tokyo 162-8601
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Okada Yoshinori
The School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555
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