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Journal Articles

Continuous and discontinuous yielding behaviors in ferrite-cementite steels

Wang, Y.*; Tomota, Yo*; Omura, Takahito*; Gong, W.*; Harjo, S.; Tanaka, Masahiko*

Acta Materialia, 196, p.565 - 575, 2020/09

 Times Cited Count:17 Percentile:89.3(Materials Science, Multidisciplinary)

Journal Articles

Mechanical and thermal properties of Zr-B and Fe-B alloys

Sun, Y.*; Abe, Yuta; Muta, Hiroaki*; Oishi, Yuji*

Journal of Nuclear Science and Technology, 57(8), p.917 - 925, 2020/08

 Times Cited Count:3 Percentile:57.22(Nuclear Science & Technology)

Journal Articles

Ion beam surface modification of Y-TZP and effects of subsequent annealing

Motohashi, Yoshinobu*; Shibata, Taiju; Harjo, S.*; Sakuma, Takaaki*; Ishihara, Masahiro; Baba, Shinichi; Sawa, Kazuhiro

Proceedings of 14th International Federation for Heat Treatment and Surface Engineering Congress Transactions of Materials and Heat Treatment Vol.25 No.5, p.1032 - 1036, 2004/10

no abstracts in English

Journal Articles

Radiation-induced swelling and softening in magnesium aluminate spinel irradiated with high-flux Cu$$^{-}$$ ions

Lee, C. G.; Omura, Takahito*; Takeda, Yoshihiko*; Matsuoka, Saburo*; Kishimoto, Naoki*

Journal of Nuclear Materials, 326(2-3), p.211 - 216, 2004/03

 Times Cited Count:4 Percentile:30.31(Materials Science, Multidisciplinary)

Magnesium aluminate spinel of single crystal was irradiated with 60 keV Cu$$^{-}$$ at a dose rate up to 100 $$mu$$A/cm$$^{2}$$, to a total dose of 3$$times$$10$$^{16}$$ ions/cm$$^{2}$$, in order to study changes in hardness and step-height swelling by high-flux implantation. Hardness determined by nano-indentation measurements steeply decreased with implantation. There is a strong negative correlation between dose-rate dependences of the hardness and the step-height swelling: the former decreases as the latter increases. The Rutherford Backscattering Spectrometry (RBS)/channeling measurements showed that the spinel is not completely amorphized over the dose-rate range in this study, and the radiation-induced softening observed is not due to amorphization. Results of optical absorbance suggested that radiation-induced point defects and their clusters on the anion sublattices of the spinel played an important role in the radiation-induced swelling under high-flux ion implantation.

Journal Articles

Triple ion beam irradiation tests on window materials of spallation targets

Futakawa, Masatoshi; Kurata, Yuji; Henry, J.*; Ioka, Ikuo; Saito, Shigeru; Naito, Akira

FZKA-6876, p.166 - 171, 2003/12

A report at MEGAPIE(Megawatt Pilot Experiment) Technical R & D Meeting is collected into an FZK report. Triple ion beam irradiation tests on T91 specimens were conducted under MEGAPIE condition using TIARA facility at JAERI. Results of triple ion beam irradiation up to 15dpa, 1400appm He, 10000appm H at 320$$^{circ}$$C were compared with those of single or dual beam irradiation of Fe or He ions by use of a micro-indentation method. Hardsness increase was mainly attributed to displacement damage by Fe ions. A little effect on hardness was found on simultaneous implantation of He and H ions. An analysis method to predict mechanical characterization form micro-indentation test results was developed on ion irradiated materials.

Journal Articles

Identification of material constants in constitutive equation by indentation test with different indenters

Wakui, Takashi*; Futakawa, Masatoshi; Tanabe, Yuji*; Ioka, Ikuo

Zairyo, 51(6), p.681 - 687, 2002/06

This paper describes the novel technique for determining constants in constitutive equaution of elastic-palstic materials by the indentation test with indenters having different tip angles. FEM analyses were carried out to evaluate the effect of material constants and the indenter tip angle on the load-depth curve. The constitutive equation was determeined from the characterized curves associated with the effects on the slope. Simiulation analyses were performed for some material models to exammine accuracy of the presented technique. It is confirmed that this technique is useful to determine the constitutive equation of sub-surface of materials or coatings.

Journal Articles

Identification of the constitutive equation by the indentation technique using plural indenters with different apex angles

Futakawa, Masatoshi; Wakui, Takashi*; Tanabe, Yuji*; Ioka, Ikuo

Journal of Materials Research, 16(8), p.2283 - 2292, 2001/08

no abstracts in English

JAEA Reports

Mechanical property of superplastic-deformed ceramics by micro-indentation method

Shibata, Taiju; Ishihara, Masahiro; Takahashi, Tsuneo*; Motohashi, Yoshinobu*; Hayashi, Kimio

JAERI-Research 2001-024, 24 Pages, 2001/03

JAERI-Research-2001-024.pdf:6.25MB

no abstracts in English

Journal Articles

Effects of superplastic deformation on dynamic hardness and young's modulus of 3Y-TZP

Shibata, Taiju; Ishihara, Masahiro; Takahashi, Tsuneo*; Motohashi, Yoshinobu*

Proceedings of Asian Pacific Conference on Fracture and Strength '01(APCFS '01) and International Conference on Advanced Technology in Experimental Mechanics '01 (ATEM '01), p.894 - 898, 2001/00

no abstracts in English

Journal Articles

Radiation damage on ceramics composites as structural materials

Ishihara, Masahiro; Baba, Shinichi; Aihara, Jun; Hayashi, Kimio; Arai, Taketoshi; Ishino, Shiori*

Proceedings of 1st Information Exchange Meeting on Basic Studies on High-Temperature Engineering, p.299 - 308, 1999/09

no abstracts in English

Journal Articles

Heat treatment effect on bilayer silica scale formed on Si-SiC

Futakawa, Masatoshi; Steinbrech, R. W.*; Wakui, Takashi*; *

Hyomen Gijutsu, 50(1), p.58 - 62, 1999/00

no abstracts in English

Journal Articles

Nanoindentation behavior of a two-dimensional carbon-carbon composite for nuclear applications

Kanari, Moriyasu*; *; ; Eto, Motokuni

Carbon, 35(10-11), p.1429 - 1437, 1997/00

 Times Cited Count:37 Percentile:81.12(Chemistry, Physical)

no abstracts in English

Journal Articles

Development of inservice inspection method for graphite components by micro-indentation technique in the HTTR

Ishihara, Masahiro; Aihara, Jun; Oku, Tatsuo*

Proc. of 14th Int. Conf. on Structural Mechanics in Reactor Technology, 2, p.455 - 462, 1997/00

no abstracts in English

Journal Articles

Development of a method for measuring residual strain based on small deformation characteristics of graphite materials

Ishihara, Masahiro; Oku, Tatsuo*

Nihon Kikai Gakkai Rombunshu, A, 62(602), p.2305 - 2309, 1996/00

no abstracts in English

14 (Records 1-14 displayed on this page)
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