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CMiyazawa, Takeshi; Kikuchi, Yuta*; Ando, Masami*; Yu, J.-H.*; Yabuuchi, Kiyohiro*; Nozawa, Takashi*; Tanigawa, Hiroyasu*; Nogami, Shuhei*; Hasegawa, Akira*
Journal of Nuclear Materials, 575, p.154239_1 - 154239_11, 2023/03
Times Cited Count：10 Percentile：84.29(Materials Science, Multidisciplinary)Watanabe, Hiromichi*; Morimoto, Kyoichi; Watanabe, Masashi; Kato, Masato; Arita, Yuji*; Konashi, Kenji*
Thermochimica Acta, 693, p.178763_1 - 178763_6, 2020/11
Times Cited Count：7 Percentile：22.59(Thermodynamics)Multi-stepwise pulse calorimetry is proposed for accurate, efficient measurements of thermophysical properties of not only ideal but also practical samples over a wide temperature range. In a single experiment for a few seconds, the sample is rapidly heated from 298 K up to the final step-temperature of around 2850 K in a multi-stepwise fashion with numerous step-temperatures, at each of which the sample attains a steady-state condition while it is maintained for an instant. The proposed calorimetry is suitable for measuring enthalpy at numerous different temperatures, because multiple enthalpy-change values between the brief steady-state conditions can be obtained in a single experiment. As a feasibility demonstration, the specific enthalpy and its uncertainty in the temperature range 1050
2850 K have been determined for Mo and W, respectively. The measured enthalpies and emissivities are compared with the corresponding standard data.
Motooka, Takafumi; Kiuchi, Kiyoshi
Materials Transactions, 43(5), p.1220 - 1224, 2002/05
Times Cited Count：2 Percentile：22.94(Materials Science, Multidisciplinary)Refractory materials such as zirconium, niobium and titanium alloys with excellent corrosion resistance in boiling nitric acid have been selected for use as structural materials of spent fuel reprocessing equipment. The fatigue crack growth rates of these materials were investigated by load control tests as a function of the stress intensity factor range in boiling 3N nitric acid and in air at room temperature. The fracture surfaces were observed by SEM. The fatigue crack growth rates of zirconium and niobium were enhanced in boiling nitric acid compared with those in air at room temperature. Acceleration effect due to corrosion fatigue was not observed in the crack growth of Ti-5Ta alloy. The fracture surfaces of Ti-5Ta alloy showed the ductile striation in both environments. On the other hand, the fracture surfaces of niobium represented the fatigue striation in air and the brittle striation due to corrosion in nitric acid. The fracture surfaces of zirconium in nitric acid showed brittle fracture and the ductile fracture related to stress corrosion cracking.
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JAERI-M 85-088, 39 Pages, 1985/07
no abstracts in English
CJ. Nucl. Mater., 128-129, p.540 - 544, 1984/00
Times Cited Count：18 Percentile：83.73(Materials Science, Multidisciplinary)no abstracts in English
