Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Ando, Masami; Wakai, Eiichi; Okubo, Nariaki; Ogiwara, Hiroyuki; Sawai, Tomotsugu; Onuki, Somei*
Nihon Kinzoku Gakkai-Shi, 71(12), p.1107 - 1111, 2007/12
Times Cited Count：1 Percentile：13.09(Metallurgy & Metallurgical Engineering)no abstracts in English
Motooka, Takafumi; Yamamoto, Masahiro
no journal, ,
The corrosion test in NaOH solution was conducted, the corrosion resistance such as Ti, Zr, and Nb alloys was evaluated, and those corrosion mechanisms were considered by the surface analysis and the electrochemical corrosion test. The test material is Nb-5W alloy, pure Nb, pure Zr, and Ti-5Ta alloy. The test solution is 1-20wt% NaOH solution of 50
C. The corrosion resistance was evaluated from the weight measurement result. Moreover, the electrochemical corrosion test and the surface analysis on the corrosion side were executed. The corrosion rate in NaOH solutions was high in Nb-5W alloy
NbTi-5Ta alloyZr. The principal ingredient of the surface film of Zr andTi-5Ta alloy were ZrO
and TiO, respectively. That of Nb and Nb-5W alloy was Na
Nb
O
. The difference of corrosion resistance originated in the solubility of film. The potential-pH diagram of Nb in the alkali region was reviewed from this experiment result.
Yamashita, Shinichiro; Tachi, Yoshiaki; Akasaka, Naoaki; Sekine, Manabu*
no journal, ,
no abstracts in English
Uchida, Yosuke*; Nagai, Yoshiyasu*; Suda, Takanori*; Hashimoto, Naoyuki*; Onuki, Somei*; Shibayama, Tamaki*; Yamashita, Shinichiro; Akasaka, Naoaki
no journal, ,
no abstracts in English
Nakata, Toshiya; Tanigawa, Hiroyasu; Komazaki, Shinichi*; Kono, Yutaka*
no journal, ,
no abstracts in English
Nakata, Toshiya; Tanigawa, Hiroyasu; Ando, Masami; Komazaki, Shinichi*; Kono, Yutaka*
no journal, ,
no abstracts in English
Sr
MnO
(x=0.315) by neutron diffractionMurata, Takeshi*; Kushida, Hiroaki*; Terai, Tomoyuki*; Kakeshita, Tomoyuki*; Osakabe, Toyotaka; Kakurai, Kazuhisa
no journal, ,
no abstracts in English
MnGa alloy crystalKushida, Hiroaki*; Fukuda, Kodai*; Terai, Tomoyuki*; Fukuda, Takashi*; Kakeshita, Tomoyuki*; Oba, Takuya*; Osakabe, Toyotaka; Kakurai, Kazuhisa
no journal, ,
no abstracts in English
Kaji, Yoshiyuki; Igarashi, Takahiro; Miwa, Yukio; Taguchi, Taketoshi; Sozawa, Shizuo; Tsukada, Takashi; Hishida, Mamoru*; Takakura, Kenichi*
no journal, ,
no abstracts in English
Ando, Masami; Tanigawa, Hiroyasu; Wakai, Eiichi; Jitsukawa, Shiro; Koyama, Akira*; Stoller, R.*
no journal, ,
no abstracts in English
Sakai, Seiji; Sugai, Isamu*; Mitani, Seiji*; Takanashi, Koki*; Naramoto, Hiroshi*; Avramov, P.; Okayasu, Satoru; Narumi, Kazumasa; Maeda, Yoshihito
no journal, ,
no abstracts in English
Ogiwara, Hiroyuki; Tanigawa, Hiroyasu; Hirose, Takanori; Enoeda, Mikio; Koyama, Akira*
no journal, ,
Reduced-activation ferritic/martensitic steels are leading candidate structural material for the blanket system of fusion reactors. The important issue in current stage is the finalization of detailed manufacturing specification for ITER test blanket module. Hot isostatic pressing (HIP) process is one of the most important methods to fabricate the first wall with cooling channels. The objective of this paper is to optimize HIP condition to obtain the excellent joints mechanical properties. The materials used were F82H steels. The joint was produced by solid state HIP method. Before HIP treatments, specimens were heated in vacuum condition to out-gas. This treatment was conducted to decrease oxidation on the surfaces. HIP treatments were carried out for 2 h at 1100 C - 140 MPa. The specimens were normalized at 960 C for 0.5 h and tempered at 750 C for 1.5 h. The bonding interface was characterized by scanning electron microscope. Charpy impact tests and tensile tests were conducted to evaluate the mechanical properties of HIP joint. Impact tests revealed that there were no significant difference in ductile-brittle transition temperatures of HIP jointed specimens and base metal specimens, but upper-shelf energy (USE) of HIP joint specimens at room temperature was about 10 % of that of base metal specimens. SEM observation on the fracture surface of HIP joint specimen revealed that a large number of oxides were formed on the HIP joint. This result indicates that oxides formed on the HIP joint are the dominant factor of the impact properties. Based on the results, the pre-HIP treatment conditions had been optimized to reduce the number of oxides, and USE of HIP joint specimen become about 50 % of base metal. The detailed analyses on HIP joint microstructure will be reported.
Tsukada, Takashi
no journal, ,
no abstracts in English
Tanigawa, Hiroyasu; Sakasegawa, Hideo; Ogiwara, Hiroyuki*; Kishimoto, Hirotatsu*; Koyama, Akira*
no journal, ,
It was previously reported that reduced-activation ferritic/martensitic steels (RAFs), such as F82H-IEA and JLF-1, showed a variety of changes in its mechanical property after neutron irradiation at 573K up to 5dpa, and have possible correlation with precipitation. In this study, irradiation effects on precipitation were investigated in detail with the emphasis on phase stability. It turned out that precipitates in the ion irradiated region become amorphous. Laves phase in aged F82H was also amorphized. An aged Fe-Ta-C model alloy contained a high density of TaC in the matrix, but those TaC precipitates disappeared in the ion-irradiation region after 20 dpa single/dual ion irradiation. This amorphization of precipitates and TaC re-solution in these RAFs was also observed in neutron irradiated RAFs.
Ono, Masao; Iguchi, Yusuke*; Bagum, R.*; Fujii, Kimio; Esaka, Fumitaka; Okayasu, Satoru; Mashimo, Tsutomu
no journal, ,
In this study, we performed an ultracentrifuge experiment on a MgCd order-disorder alloy at disordered state of solid solution. The experimental conditions were as follows: maximum acceleration: 610,000 g, temperature: 400C, composition: Mg:Cd=50:50at%, time duration: 60 h). We investigated the crystal state of the centrifuged sample that had ordered from the disorder state of atomic-scale graded structure. It was found that the graded structure was formed in the centrifuged sample, in which Cd content continuously increased in the direction of gravitational field. It was also found that the different peaks from the starting state appeared in X-ray diffraction patterns of the centrifuged sample.
Kirihara, Kazuhiro*; Kawaguchi, Kenji*; Shimizu, Yoshiki*; Sasaki, Takeshi*; Koshizaki, Naoto*; Kimura, Kaoru*; Yamada, Yoichi; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
Radiation effects of the boron nano-belt on the electronic conductivity have been studied.
Inoue, Aichi; Takano, Katsuyoshi; Yamamoto, Shunya; Nagata, Shinji*; Shikama, Tatsuo*
no journal, ,
no abstracts in English
