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Yokoyama, Kenichi*; Murata, Yusuke*; Shiimori, Fusae*; Sakai, Junichi*; Yamamoto, Masahiro; Uchiyama, Gunzo; Nojima, Yasuo*; Fujine, Sachio*
Fushoku Boshoku Kyokai Dai-58-Kai Zairyo To Kankyo Toronkai Koenshu, p.11 - 12, 2011/09
Characteristics of hydrogen embrittlement of pure Ti and Ti-5Ta alloys were evaluated by stress loading and constant load tests. Mechanical properties of these materials were affected by hydride formation of surface layers. Although elongation was reduced by hydrogen absorption, embrittlement was observed only in the surface hydride area. It is also suggested that Ti-5Ta alloy was better susceptibility of hydrogen embrittlement than pure Ti.
Shiimori, Fusae*; Sakai, Junichi*; Yokoyama, Kenichi*; Motooka, Takafumi; Uchiyama, Gunzo; Nojima, Yasuo*; Fujine, Sachio*
Fushoku Boshoku Kyokai Dai-58-Kai Zairyo To Kankyo Toronkai Koenshu, p.13 - 14, 2011/09
In reprocessing plants, hydrogen gas was released by radiolysis of aqueous solution. The relationship of the amount of hydrogen gas and the amount of hydrogen absorption to titanium and Ti-5Ta were not clear. In this study, hydrogen was absorbed to titanium by the cathode charging and irradiation. Then, the amount of the hydrogen gas from solutions and the amount of the hydrogen absorbed to titanium was compared. It was found that a very small amount of the hydrogen by radiolysis was absorbed to titanium. It was suggested that the difference of the hydrogen absorption rate was caused by the difference of the hydrogen concentration on the metal surface.
Nakashima, Yukifusa*; Sakai, Yukio*; Sasao, Masayasu*
JNC TJ7440 99-013, 47 Pages, 1999/03
no abstracts in English
Nakashima, Yukifusa*; Sakai, Yukio*; Sasao, Masayasu*
JNC TJ7440 99-002, 244 Pages, 1999/01
no abstracts in English
Nakashima, Yukifusa*; Sasao, Masayasu*; Sakai, Yukio*
PNC TJ7411 97-001, 59 Pages, 1997/03
None
Nakashima, Yukifusa*; Sakai, Yukio*; Sasao, Masayasu*
JNC TJ7440 99-021, 294 Pages, 1996/11
no abstracts in English
Nakashima, Yukifusa*; Sakai, Yukio*; *
PNC TJ7411 96-002, 68 Pages, 1996/03
no abstracts in English
Hosobori, Kenji*; Toyooka, Yoshinori*; Sakai, Yukio*
PNC TJ1411 93-001, 945 Pages, 1993/01
None
Sakai, Yukio*; Tange, Yoshiki*
JNC TJ7400 2005-061, 377 Pages, 1992/02
JNC-TJ7400-2005-061.pdf:89.05MB
None
Motooka, Takafumi; Yamamoto, Masahiro; Ueno, Fumiyoshi; Ishijima, Yasuhiro; Uchiyama, Gunzo; Nojima, Yasuo*; Fujine, Sachio*; Sakai, Junichi*; Shiimori, Fusae*; Miyasaka, Yuto*
no journal, ,
As a part of studies on ageing behavior of reprocessing plants, the amount of hydrogen gas generated from nitrate solutions under 
irradiation and the amount of hydrogen absorbed to titanium alloy were measured after irradiation in order to evaluate the hydrogen degradation of instruments made of titanium alloy. The amount of hydrogen gas was decreased with increase of nitrate concentration. Only a little hydrogen was absorbed to titanium. It is necessary to consider the long-time prediction model for hydrogen adsorption to evaluate hydrogen degradation.
Ishijima, Yasuhiro; Motooka, Takafumi; Ueno, Fumiyoshi; Yamamoto, Masahiro; Uchiyama, Gunzo; Sakai, Junichi*; Yokoyama, Kenichi*; Tada, Eiji*; Tsuru, Toru*; Nojima, Yasuo*; et al.
no journal, ,
Titanium and Ti-5mass%Ta alloy has been utilized in nuclear fuel reprocessing plant material because of its superior corrosion resistance in nitric acid solutions. However, Ti alloy have been known to high susceptibility of hydrogen embrittlement. To evaluate properties of hydrogen absorption and hydrogen embrittlement of Ti alloys, cathodic polarization tests and slow strain rate tests (SSRT) under cathodic polarization were carried out. Results show titanium hydrides covered on the surface of metals and hydrides thickness were within 
m. Ti and Ti-5%Ta did not show hydrogen embrittlement by SSRT under cathodic charging. These results suggested that Ti and Ti-5%Ta could absorb hydrogen. But hydrogen did not penetrate inner portion of the metals more than m in depth because titanium hydrides act as barrier of hydrogen diffusion. It is considered that retardation of hydrogen diffusion hindered hydrogen embrittlement of Ti and Ti-5%Ta alloys.