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Journal Articles

Viscosity measurement of nickel and stainless steel aiming at systematic viscosity measurement for molten mixture of stainless steel and boron-carbide

Kokubo, Hiroki*; Nishi, Tsuyoshi*; Ota, Hiromichi*; Yamano, Hidemasa

Nippon Kinzoku Gakkai-Shi, 82(10), p.400 - 402, 2018/09

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

It is important to obtain the viscosity of a mixed alloy consisting of molten stainless steel and boron-carbide (SUS316L + B$$_{4}$$C alloy) for the improvement of severe accident assessment methodology for sodium-cooled fast reactors. In this study, the viscosities of the molten nickel (Ni) and stainless steel (SUS316L) were measured by the oscillating crucible method to confirm the performance of the viscosity measurement apparatus as a first step. The viscosities of molten Ni and SUS316L melts were measured up to 1823 K. It was found that the measured viscosity values of molten Ni and SUS316L were estimated from the deviation of the experimental data, were $$pm$$4% and $$pm$$3%, respectively. It was also found that those of molten Ni and SUS316L were close to those of the literature values of molten Ni and similar composite stainless steels. Moreover, we tentatively measured the viscosity of molten SUS316L-5 mass%B$$_{4}$$C alloy. The fitted results of the viscosity for molten Ni and SUS316L were obtained.

Journal Articles

Recent research in solvent extraction of platinum group metals

Narita, Hirokazu*; Suzuki, Tomoya*; Motokawa, Ryuhei

Nippon Kinzoku Gakkai-Shi, 81(4), p.157 - 167, 2017/04

 Times Cited Count:3 Percentile:61.55(Metallurgy & Metallurgical Engineering)

Journal Articles

Observation of transient structural changes on hydrogen absorption process of LaNi$$_{4.75}$$Sn$$_{0.25}$$ by time resolved X-ray diffraction

Machida, Akihiko; Higuchi, Kensuke*; Katayama, Yoshinori; Sakaki, Koji*; Kim, H.*; Nakamura, Yumiko*

Nippon Kinzoku Gakkai-Shi, 79(3), p.124 - 130, 2015/03

 Times Cited Count:3 Percentile:70.36(Metallurgy & Metallurgical Engineering)

Structural changes on hydrogen absorption process of hydrogen absorbing alloy LaNi$$_{4.75}$$Sn$$_{0.25}$$ have been investigated by time-resolved X-ray diffraction measurements using synchrotron radiation source. We have found the transient intermediate phase between the solid solution and hydride phases of LaNi$$_{4.75}$$Sn$$_{0.25}$$ under non-equilibrium hydrogen pressure condition at room temperature. LaNi$$_{4.75}$$Sn$$_{0.25}$$ has transformed into the hydride through three phase co-existing state. The hydrogen content of the intermediate phase estimated from the unit cell volume is independent of the induced hydrogen gas pressure. The variation of lattice constants indicate that the hydrogen atoms are located at the La$$_{2}$$Ni$$_{2}$$(Ni,Sn)$$_{2}$$ octahedron and La$$_{2}$$(Ni,Sn)$$_{2}$$ tetrahedron in the intermediate phase.

Journal Articles

Compositional dependence of hydrogenation properties in Ti$$_{1+y}$$(Fe$$_{1-x}$$Mn$$_{x}$$)$$_{1-y}$$ ($$0.2 leq x leq 0.5$$, $$0 leq y leq 0.08$$)

Sakaki, Koji*; Kim, H.*; Machida, Akihiko; Watanuki, Tetsu; Nakamura, Yumiko*

Nippon Kinzoku Gakkai-Shi, 79(3), p.112 - 117, 2015/03

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Effect of a quenching rate on hydrogen storage properties of V$$_{0.79}$$Ti$$_{0.2}$$Zr$$_{0.01}$$

Kim, H.*; Sakaki, Koji*; Asano, Kota*; Ikeda, Kazutaka*; Otomo, Toshiya*; Machida, Akihiko; Watanuki, Tetsu; Nakamura, Yumiko*

Nippon Kinzoku Gakkai-Shi, 79(3), p.131 - 136, 2015/03

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Low temperature and pressure synthesis of lithium-nitride compound with H$$_{2}$$O addition on lithium target for BNCT

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nippon Kinzoku Gakkai-Shi, 78(8), p.317 - 321, 2014/08

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

Low temperature synthesis of lithium-nitride compound was conducted on the lithium target for BNCT by N$$_{2}$$/H$$_{2}$$O mixing gas squirt in the ultra high vacuum chamber, and the following results were derived; (1) Lithium-nitride compound was synthesized on the lithium target under 101.3 Pa N$$_{2}$$ gas squirt at room temperature and in the ultra high vacuum chamber under the pressure of 1$$times$$10$$^{-8}$$ Pa. (2) Remarkable contamination by O and C was observed on the lithium-nitride compound synthesized under the squirt pressure of 13.3-80 Pa/1.33-4.7 Pa N$$_{2}$$/H$$_{2}$$O mixing gas. (3) No contamination and synthesis of Li-N compound was observed under the squirt pressure of 0.013-0.027 Pa/0-0.005 Pa N$$_{2}$$/H$$_{2}$$O mixing gas. (4) Contamination by O and C was enhanced with excessive addition of H$$_{2}$$O at the pressure of over 1.33 Pa.

Journal Articles

Surficial chemical states of Li$$_{3}$$N synthesized on lithium target for boron neutron capture therapy

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nippon Kinzoku Gakkai-Shi, 78(8), p.322 - 325, 2014/08

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

To remove high level of contaminants by O and C from Li$$_{3}$$N surface for boron neutron capture therapy target, high temperature thermal desorption was conducted up to 1123 K in ultra high vacuum and the following results were derived; (1) During thermal desorption up to 1023 K, typical three peaks of vacuum pressure disturbance due to vaporization of contaminants were observed in vacuum pressure-temperature curve. (2) Over-layered contaminants with high melting temperature below 1023 K on Li$$_{3}$$N surface is completely removed by high temperature thermal desorption up to 1123 K in ultra high vacuum. (3) From these desorption results, it is suggested that these contaminants corresponding to these vaporization peaks are H$$_{2}$$O and Li compounds with high melting temperature below 1023 K, of which LiOH and Li$$_{2}$$CO$$_{3}$$ were synthesized by decomposition process of Li$$_{3}$$N with residual H$$_{2}$$O and CO$$_{2}$$ in low temperature.

Journal Articles

Direct synthesis of Li$$_{3}$$N thin layer on lithium target surface for BNCT in N$$_{2}$$ gaseous conditions

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nippon Kinzoku Gakkai-Shi, 78(4), p.137 - 141, 2014/04

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

To prevent vaporization damage of BNCT (Boron Neutron Capture Therapy) lithium target during operation, direct synthesis of Li$$_{3}$$N thin layer on lithium target surface was demonstrated in 0.1 MPa N$$_{2}$$ gas at temperature below 548 K and the following conclusions were derived; (1) Synthesis of Li$$_{3}$$N thin layer on lithium surface was confirmed after nitridation at 276$$sim$$548 K with surface contamination by oxygen and carbon. (2) Rapid nitridation over 1-5wt.%/min was observed above Li melting temperature, whereas slow reaction under 0.02-0.5 wt.%/min below melting temperature. (3) During nitridation, removal of oxygen contamination on Li$$_{3}$$N thin layer is taken place by nitrogen below Li melting temperature.

Journal Articles

Evaluation of applicability on multi-axis residual stress formed by hard sphere indentation for stress corrosion cracking test

Ioka, Ikuo; Kiuchi, Kiyoshi*; Takizawa, Masayuki*; Ito, Takeshi*

Nippon Kinzoku Gakkai-Shi, 78(1), p.16 - 22, 2014/01

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

A multi-axis stress field is indispensable to quick and quantitative evaluation of stress corrosion cracking for constructional materials and weld joints of existing industrial plants. The applicability of multi-axis residual stress field into SCC tests was evaluated. The hard sphere ball was stuffed into small flat-plate of type 304SS. Numerical analysis was conducted in order to compare with the experimental results. The numerical analysis was comparatively in agreement with the experimental results. Parameters of the test were selected by numerical analysis to optimize the residual stress of specimen. SCC test in MgCl$$_{2}$$ was performed using the specimen with optical residual stress condition. It is confirmed that the multi-axis residual stress field was useful in quick and quantitative SCC test by comparing the initiation of cracks with the distribution of residual stress obtained by numerical analysis.

Journal Articles

Influence of competition between intragranular dislocation nucleation and intergranular slip transfer on mechanical properties of ultrafine-grained metals

Tsuru, Tomohito; Aoyagi, Yoshiteru*; Kaji, Yoshiyuki; Shimokawa, Tomotsugu*

Nippon Kinzoku Gakkai-Shi, 78(1), p.45 - 51, 2014/01

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

Huge-scale atomistic simulations of shear deformation tests to the aluminum polycrystalline thin film containing the Frank-Read source are performed to elucidate the relationship between the inter- and intragranular plastic deformation processes and the mechanical properties of ultrafine-grained metals. While the first plastic deformation occurs by the dislocation bow-out motion within the grain region for both models, the subsequent plastic deformation is strongly influenced by the resistance of the slip transfer by dislocation transmission through grain boundaries. The influence of the competition between the intragranular dislocation nucleation and intergranular slip transfer on the material strength is considered.

Journal Articles

Improvement effects of TiCl$$_{3}$$ on dehydrogenation of magnesium borohydride Mg(BH$$_{4}$$)$$_{2}$$

Li, H.-W.*; Matsumura, Daiju; Nishihata, Yasuo; Akiba, Etsuo*; Orimo, Shinichi*

Nippon Kinzoku Gakkai-Shi, 77(12), p.627 - 630, 2013/12

 Times Cited Count:3 Percentile:69.9(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Thermal stability of BNCT neutron production target synthesized by ${it in-situ}$ lithium deposition and ion implantation

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nippon Kinzoku Gakkai-Shi, 77(11), p.509 - 513, 2013/11

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

To testify thermal stability of the BNCT neutron target synthesized by ${it in-situ}$ lithium deposition and ion implantation, laser heating test of the Li$$_{3}$$N/Li/Cu tri-layered target was conducted in high vacuum chamber of 10$$^{-6}$$ Pa and thermal stability of the tri-layered target was characterized by X-ray photoelectron spectroscopy. Following conclusions were derived; (1) The Li$$_{3}$$N/Li/Cu tri- layered target with very low oxide and carbon contamination was synthesized by ${it in-situ}$ lithium deposition and ion implantation techniques without H$$_{2}$$O and O$$_{2}$$ additions (2) The starting temperature of evaporation of the Li$$_{3}$$N/Li/Cu tri-layered target increased by 120 K compared to that of the Li/Cu target and (3) frequent repair synthesis of the damaged Li$$_{3}$$N/Li/Cu tri-layered target caused by evaporation is possible.

Journal Articles

Small-angle neutron scattering measurements of the averaged internal structures in neodymium-iron-boron (Nd-Fe-B) sintered magnets

Takeda, Masayasu; Suzuki, Junichi*; Akiya, Takahiro*; Kato, Hiroaki*

Nippon Kinzoku Gakkai-Shi, 76(3), p.165 - 176, 2012/03

 Times Cited Count:1 Percentile:21.59(Metallurgy & Metallurgical Engineering)

Journal Articles

Hydrogenation reactions of A6061 alloys at ultra-high pressures

Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi; Akiba, Etsuo*

Nippon Kinzoku Gakkai-Shi, 76(2), p.139 - 143, 2012/02

 Times Cited Count:1 Percentile:85.46(Metallurgy & Metallurgical Engineering)

Journal Articles

Correlation between tensile property and micro-hardness irradiated RAF/M steel

Ando, Masami; Wakai, Eiichi; Tanigawa, Hiroyasu; Kawasaki, Yasushi

Nippon Kinzoku Gakkai-Shi, 72(10), p.785 - 788, 2008/10

 Times Cited Count:1 Percentile:84.94(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

First-principles calculations of the grain-boundary cohesive energy; Embrittling or strengthening effect of solute segregation in a bcc Fe$$Sigma$$3(111) grain boundary

Yamaguchi, Masatake

Nippon Kinzoku Gakkai-Shi, 72(9), p.657 - 666, 2008/09

 Times Cited Count:15 Percentile:34.21(Metallurgy & Metallurgical Engineering)

The microscopic mechanism of the grain boundary embrittlement in metals by solute segregation has been not well understood for many years. From first-principles calculations, we show here that the calculated cohesive energy ($$2gamma_{int}$$) of bcc iron $$Sigma$$3(111) symmetrical tilt grain boundary is reduced by the segregation of sulfur (S) or phosphorous (P), while it is increased by the segregation of boron (B) or carbon (C). The rate of the decrease/increase in the $$2gamma_{int}$$ was excellently proportional to the experimental ductile-to-brittle transition temparature (DBTT) shift with increasing segregation; this demonstrates that the grain boundary embrittlement is governed by the change in the 2$$gamma_{int}$$.

Journal Articles

Corrosion of CrN-coated steels for nuclear reactors in liquid Pb-Bi

Kurata, Yuji; Futakawa, Masatoshi

Nippon Kinzoku Gakkai-Shi, 72(6), p.470 - 476, 2008/06

 Times Cited Count:1 Percentile:84.94(Metallurgy & Metallurgical Engineering)

Corrosion tests of CrN-coated steels for nuclear reactors were conducted in liquid lead-bismuth (Pb-Bi) at 450$$^{circ}$$C and 550$$^{circ}$$C for 3000 h to investigate the applicability of CrN coating to a liquid Pb-Bi environment. CrN coatings on F82H (Fe-8Cr-2W-0.3V-0.04Ta-0.1C) and 316SS exhibited good compatibility in liquid Pb-Bi during corrosion test at 450$$^{circ}$$C. The CrN coating layer suffered heavy damage such as cracking and spalling, and showed no effectiveness as a protective layer in corrosion test at 550$$^{circ}$$C. Nickel and chromium in 316SS dissolved into Pb-Bi through the damaged coating layer at 550$$^{circ}$$C. The cracking and spalling were not found after heating CrN-coated steels in Ar gas at 550$$^{circ}$$C. It is considered that stresses caused by the difference of thermal expansion coefficients between CrN and steels led to cracking and spalling of the CrN coating through corrosion attack by liquid Pb-Bi at 550$$^{circ}$$C.

Journal Articles

Effects of electro-slag remelting on inclusion formation and impact property of reduced activation ferritic/martensitic steels

Sawahata, Atsushi; Tanigawa, Hiroyasu; Enomoto, Masato*

Nippon Kinzoku Gakkai-Shi, 72(3), p.176 - 180, 2008/03

 Times Cited Count:11 Percentile:42.59(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Extra-irradiation hardening of reduced activation ferritic/martensitic steel by multi-ion irradiation

Ando, Masami; Wakai, Eiichi; Okubo, Nariaki; Ogiwara, Hiroyuki; Sawai, Tomotsugu; Onuki, Somei*

Nippon Kinzoku Gakkai-Shi, 71(12), p.1107 - 1111, 2007/12

 Times Cited Count:1 Percentile:85.32(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Irradiation creep behavior of reduced activation ferritic/martensitic steel irradiated in HFIR

Ando, Masami; Tanigawa, Hiroyasu; Shiba, Kiyoyuki; Jitsukawa, Shiro; Kono, Yutaka*; Koyama, Akira*; Li, M.*; Stoller, R. E.*

Nippon Kinzoku Gakkai-Shi, 71(7), p.559 - 562, 2007/07

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

no abstracts in English

70 (Records 1-20 displayed on this page)