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Nb and NiTa intermetallic compounds induced by energetic ion beam irradiationKojima, Hiroshi*; Yoshizaki, Hiroaki*; Kaneno, Yasuyuki*; Semboshi, Satoshi*; Hori, Fuminobu*; Saito, Yuichi; Okamoto, Yoshihiro; Iwase, Akihiro*
Nuclear Instruments and Methods in Physics Research B, 372, p.72 - 77, 2016/04
Times Cited Count：9 Percentile：64.88(Instruments & Instrumentation)NiNb and NiTa intermetallic compounds, which show the complicated lattice structures were irradiated with 16 MeV Au
ions at room temperature. The X-ray diffraction measurement revealed that the lattice structure of these intermetallic compounds changed from the ordered structures to the amorphous state by the ion irradiation. The irradiation-induced amorphization caused the increase in Vickers hardness. The result was compared with our previous results for NiAl and NiV, and was discussed in terms of the intrinsic lattice structures of the samples.
Nakamichi, Masaru; Kim, Jae-Hwan
Fusion Engineering and Design, 98-99, p.1838 - 1842, 2015/10
Times Cited Count：15 Percentile：77.56(Nuclear Science & Technology)Advanced neutron multipliers with high stability at high temperatures are desired for the pebble bed blankets of DEMO reactors. Beryllium intermetallic compounds (beryllides) are the most promising material for this purpose. To fabricate the beryllide pebbles, a new granulation process has been established that combines a plasma sintering method for beryllide synthesis and a rotating electrode method using a plasma-sintered electrode for granulation. In granulation examinations, prototypic pebbles 1 mm in diameter of Be-V beryllide as well as Be-Ti beryllide were successfully fabricated. This study performed not only granulation of binary beryllides but also its characterization of the hydrogen generation reaction with water vapor compared with those of pure Be pebbles.
Pb
intermetallic compoundOno, Masao; Huang, X. S.*; Shibata, Yasuhiro*; Iguchi, Yusuke*; Sakai, Seiji; Maekawa, Masaki; Chen, Z. Q.*; Osakabe, Toyotaka; Kawasuso, Atsuo; Naramoto, Hiroshi*; et al.
Proceedings of 1st International Conference on Diffusion in Solids and Liquids (DSL 2005), p.531 - 533, 2005/07
Recently, we formed atomic-scale graded structures in some miscible alloys and observed the decomposition in BiPb intermetallic compound by sedimentation of atoms under strong gravitational field. In this study, we measured positron lifetime of centrifuged BiPb, to which the composition change was very small as it was treated at low temperature. It was found that the positron lifetime became longer than that of starting state. This indicated that the point defects (vacancy or divacancy) increased in the sample by centrifugal treatment. We are now investigating the relationship between increase in point defects and sedimentation of atoms.
Ono, Masao; Huang, X.*; Kinoshita, Takahiro*; Ueno, Hideto*; Osakabe, Toyotaka; Mashimo, Tsutomu
Defect and Diffusion Forum, 237-240(2), p.1101 - 1104, 2005/00
Ultra-strong gravitational field can induce sedimentation of even atoms in condensed matter. We had realized sedimentation of substitutional solute atoms in some miscible alloys. How about in the other alloys? So, In this study, the ultra-centrifuge experiments were performed on an intermetallic compound of Bi-Pb system (BiPb) by changing time duration of experiment time (experimental conditions; maximum centrifugal force: 1.0
10
g level, temperature: 130-150 
C, duration: 30-150h, state: solid). Composition changes were observed in the centrifuged samples. And, it was found that the Bi phase appeared from starting state of BiPb around the weak gravitational field region of the sample. These results showed that sedimentation of substitutional solute atoms occurred, and induced the structure change in intermetallic compounds.
Ishiyama, Shintaro; Buchkremer, H. P.*; St
ver, D.*
Nihon Kinzoku Gakkai-Shi, 68(9), p.831 - 837, 2004/09
Times Cited Count：0 Percentile：0.01(Metallurgy & Metallurgical Engineering)NiAl intermetallics with dispersive Cr particles consolidated by the Hot Isostaic Press(HIP) and Reactive HIP(RHIP) techniques, has been investigated. Mechanical properties of HIPed and RHIPed materials with various Cr concentrations ranging form 0 to 30 mass.%Cr, were examined at various temperatures. The consolidation temperature of RHIP materials decreases with Cr addition; when RHIPing NiAl+xCr compounds with 25 mass% has attained, remarkable high ductility over 17% elongation and over 400MPa tensile strength at 873K. A very high tensile strength of HIPed NiAl+20wt.%Cr about 600MPa with 10% elongation was achieved at 873K.
Kawamura, Hiroshi; Takahashi, Heishichiro*; Yoshida, Naoaki*; Mishima, Yoshinao*; Ishida, Kiyohito*; Iwadachi, Takaharu*; Cardella, A.*; Van der Laan, J. G.*; Uchida, Munenori*; Munakata, Kenzo*; et al.
Journal of Nuclear Materials, 329-333(1), p.112 - 118, 2004/08
Times Cited Count：33 Percentile：87.58(Materials Science, Multidisciplinary)no abstracts in English
and its electrical and magnetic propertiesAoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Takeuchi, Tetsuya*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 73(7), p.1665 - 1668, 2004/07
Times Cited Count：43 Percentile：81.99(Physics, Multidisciplinary)no abstracts in English
Ti/(Be) and BeV/(Be) two-phase alloysMishima, Yoshinao*; Yamamoto, Keisuke*; Kimura, Yoshisato*; Uchida, Munenori*; Kawamura, Hiroshi
JAERI-Conf 2004-006, p.184 - 189, 2004/03
no abstracts in English
Onuma, Ikuo*; Kainuma, Ryosuke*; Uda, Minoru*; Iwadachi, Takaharu*; Uchida, Munenori*; Kawamura, Hiroshi; Ishida, Kiyohito*
JAERI-Conf 2004-006, p.172 - 183, 2004/03
no abstracts in English
Ti electrode for pebble production by rotating electrode methodUda, Minoru*; Iwadachi, Takaharu*; Uchida, Munenori*; Nakamichi, Masaru*; Kawamura, Hiroshi
JAERI-Conf 2004-006, p.190 - 195, 2004/03
no abstracts in English
Iwadachi, Takaharu*; Uchida, Munenori*; Mishima, Yoshinao*; Fujita, Akitsugu*; Kawamura, Hiroshi; Shestakov, V.*; Miyakawa, Masaru*
JAERI-Conf 2004-006, p.196 - 202, 2004/03
no abstracts in English
Uchida, Munenori*; Uda, Minoru*; Iwadachi, Takaharu*; Nakamichi, Masaru; Kawamura, Hiroshi
Journal of Nuclear Materials, 329-333(Part2), p.1342 - 1346, 2004/00
Times Cited Count：5 Percentile：35.25(Materials Science, Multidisciplinary)In this paper, an elemental technology to fabricate beryllide rods by the vacuum casting was researched. Furnace material study to prevent the chemical reaction with beryllide and casting procedure study to cast durable ingot without any shrinkages and cracks were performed. From the results of the reactivity test of refractory material with BeTi, it was clear that the BeO crucible had less reactivity with melt and no contamination. From the results of casting tests with a MgO cylindrical mold in a vacuum chamber, it was revealed that the mold dimension was critical to minimize shrinkages and cracks. It was also found that the forced cooling by the MgO cylindrical sleeve with water-cooled copper mold on the bottom was efficient to improve the shrinkages and the cracks.
TiIwakiri, Hirotomo*; Yasunaga, Kazufumi*; Yoshida, Naoaki*; Uchida, Munenori*; Kawamura, Hiroshi
Journal of Nuclear Materials, 329-333(Part A), p.880 - 884, 2004/00
Times Cited Count：8 Percentile：48.81(Materials Science, Multidisciplinary)no abstracts in English
Department of JMTR, Oarai
JAERI-Review 2003-026, 163 Pages, 2003/09
JAERI-Review-2003-026.pdf:16.05MB
no abstracts in English
Yamada, Hirokazu*; Nagao, Yoshiharu; Kawamura, Hiroshi; Nakao, Makoto*; Uchida, Munenori*; Ito, Haruhiko
Fusion Engineering and Design, 69(1-4), p.269 - 273, 2003/09
Times Cited Count：14 Percentile：66.94(Nuclear Science & Technology)no abstracts in English
Ti and Li
TiONakamichi, Masaru; Kawamura, Hiroshi; Uchida, Munenori*
Fusion Engineering and Design, 69(1-4), p.257 - 261, 2003/09
Times Cited Count：9 Percentile：49.89(Nuclear Science & Technology)no abstracts in English
TiUchida, Munenori*; Ishitsuka, Etsuo; Kawamura, Hiroshi
Fusion Engineering and Design, 69(1-4), p.499 - 503, 2003/09
Times Cited Count：26 Percentile：82.89(Nuclear Science & Technology)no abstracts in English
Uchida, Munenori*; Kawamura, Hiroshi; Uda, Minoru*; Ito, Yoshio*
Fusion Engineering and Design, 69(1-4), p.491 - 498, 2003/09
Times Cited Count：15 Percentile：69.06(Nuclear Science & Technology)no abstracts in English
Kawamura, Hiroshi; Ishitsuka, Etsuo; Tsuchiya, Kunihiko; Nakamichi, Masaru; Uchida, Munenori*; Yamada, Hirokazu*; Nakamura, Kazuyuki; Ito, Haruhiko; Nakazawa, Tetsuya; Takahashi, Heishichiro*; et al.
Nuclear Fusion, 43(8), p.675 - 680, 2003/08
Times Cited Count：28 Percentile：64.08(Physics, Fluids & Plasmas)no abstracts in English
Pd
Si
Metoki, Naoto; Koike, Yoshihiro; Haga, Yoshinori; Kaneko, Koji; Araki, Shingo; McEwen, K. A.*; Kogi, Masafumi*; Aso, Naofumi*; Lander, G. H.; Komatsubara, Takemi*; et al.
Journal of Physics; Condensed Matter, 15(28), p.S1957 - S1963, 2003/07
Times Cited Count：2 Percentile：15.16(Physics, Condensed Matter)no abstracts in English
