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Shimo, Michito*; Niwa, Masakazu; Miyakawa, Kazuya; Amano, Kenji; Tonokura, Kenichi*; Tokunaga, Tomochika*
Fukada Chishitsu Kenkyujo Nempo, (22), p.119 - 137, 2021/00
no abstracts in English
Sawai, Tomotsugu; Wakai, Eiichi; Tomita, Takeshi; Naito, Akira; Jitsukawa, Shiro
Journal of Nuclear Materials, 307-311(Part1), p.312 - 316, 2002/12
Times Cited Count：20 Percentile：76.08(Materials Science, Multidisciplinary)TIG-weld joints of the IEA heat of F82H were irradiated by TIARA. Transmission electron microscope (TEM) specimens were prepared by a focused ion beam (FIB) system. TEM specimens were obtained from the heat affected zone (HAZ) and the weld metal. HAZ specimens had typical bi-modal cavity microstructure after 50 dpa at 450
C with He/dpa ratio of 10 appmHe/dpa. Larger voids about 30 nm were observed in the tempered side specimen, while the size of voids in the quenched side specimen was less than 15 nm. Ac1 temperature determined by heat-treated base metal is 820C. Cavity growth in specimens tempered at higher temperature was enhanced, while that in cold worked ones is suppressed.
Wakai, Eiichi; Hashimoto, Naoyuki*; Robertson, J. P.*; Sawai, Tomotsugu; Hishinuma, Akimichi
Journal of Nuclear Materials, 307-311(Part.1), p.352 - 356, 2002/12
Times Cited Count：11 Percentile：58.11(Materials Science, Multidisciplinary)no abstracts in English
ion irradiationWakai, Eiichi; Ezawa, Tadashi*; Imamura, Junko*; Takenaka, Tsuyoshi*; Tanabe, Tetsuo*; Oshima, Ryuichiro*
Journal of Nuclear Materials, 307-311(Part.1), p.367 - 373, 2002/12
Times Cited Count：29 Percentile：84.88(Materials Science, Multidisciplinary)no abstracts in English
O
Katano, Yoshio*; Aruga, Takeo; Yamamoto, Shunya; Nakazawa, Tetsuya; Yamaki, Daiju; Noda, Kenji
Journal of Nuclear Materials, 283-287(Part.2), p.942 - 946, 2000/12
Times Cited Count：0 Percentile：0.01(Materials Science, Multidisciplinary)no abstracts in English
*
JNC TN1400 2000-006, 68 Pages, 2000/07
JNC-TN1400-2000-006.pdf:2.18MB
no abstracts in English
Sakaki, Hironao; Nagai, Ryoji; Yoshikawa, Hiroshi; Minehara, Eisuke
Proceedings of 25th Linear Accelerator Meeting in Japan, p.261 - 263, 2000/07
no abstracts in English
; Ueno, Fumiyoshi
JNC TN9400 2000-017, 10 Pages, 2000/03
JNC-TN9400-2000-017.pdf:0.58MB
lt is difficult to get hold the behave of growth of cavity which nucleates in grain boudaly in experimental observation. lt is considerd that numerical simulation is effective for the grasp of behave of cavity growth, because it is able to grasp the microscopic behavior of internal material whici is hardly observation. We examine the factor that the diffusive ratio and the stress etc., affected growth of cavity on grain boundary with numerical simulation using diffusive equation. As the result, a following knowledge was obtained. (1)With dominant of grain boundary diffusion, the shape of cavity transitions from quasi-equilibrium to crac-like. ln other hand, with dominant of surface diffusion, cavity grows up with initial shape. (2)With dominate of grain boundary diffusion, it accelerates the growth rate of the cavity near the tip by grain boundaly diffusion induced stressing perpendicular to gain boundary (3)With dominant of surface diffusion, the distribution of chemical potential is uniformity on cavity surface. ln other hand, with dominant of grain boundary diffusion compare to that of surface diffusion, the gradient of chemical potential is increased at the tip of cavity.
Aruga, Takeo; Katano, Yoshio*
Proceedings of 2000 International Conference on Ion Implantation Technology (IIT 2000), p.797 - 800, 2000/00
no abstracts in English
O irradiated with triple beam of H, He and heavy ionsKatano, Yoshio*; Aruga, Takeo; Yamamoto, Shunya; Nakazawa, Tetsuya; Yamaki, Daiju
Proceedings of 2000 International Conference on Ion Implantation Technology (IIT 2000), p.805 - 808, 2000/00
no abstracts in English
Kusano, Joichi; Ouchi, Nobuo; Akaoka, Nobuo*; Takeda, O.*; Matsuoka, Masanori*; Saito, Kenji*; Noguchi, Shuichi*; Inoue, Hitoshi*; Mukugi, Ken*; Mizumoto, Motoharu
Proceedings of 25th Linear Accelerator Meeting in Japan, p.317 - 319, 2000/00
no abstracts in English
Ohara, Kazuhiro*; Kusano, Joichi; Inoue, Hitoshi*; Takaishi, Kazutoshi*; Yamada, Takayuki*; Ouchi, Nobuo; Ota, Tomoko*
Dai-50-Kai Sosei Kako Rengo Koenkai Koen Rombunshu, p.199 - 200, 1999/10
no abstracts in English
*; *; *; *
PNC TJ9601 96-003, 38 Pages, 1996/03
In this study, for the purpose of development of a nondestructive detection technique of creep-fatigue damage in Type 316FR stainless steel for fast reactors, application study of electrochemical methods and the Induced Current Potential Drop(ICFPD) was done. Applicability of electrochemical methods to evaluation of grain boundary precipitates which, provide preferred site for cavities was investigated. Anodic polarization curves were measured both in 1N KOH solution and in 1N HSO
+KSCN solution. An anodic current peak that, corresponds to preferential dissolution of the grain boundary precipitates was observed in the measurements using in the KOH solutlon. It was suggested that evolution of the grain boundary precipitates which should be associated with creep-fatigue damage can be evaluated by the electrochemical method using KOH solution. The results of reactivation ratio of the material in 1N HSO+KSCN solution, which is recognized as the sensitive indicator of Cr-depletion, suggested a correlation between the reactivation ratio and creep-fatigue damage. Clear differences between the as-received material and the creep-fatigue damaged sample were found in ICFPD results. Although more detailed investigation is required to make a conclusion, it was expected that potential drop can reflect creep-fatigue damage in the microstructure, e.g. precipitates cavities, surface cracks. Based on the preliminaly result, the ICFPD technique may be expected to provide a quantitative monitoring capability of creep-fatigue damage.
Kabasawa, M.*; *; Harami, Taikan; Shimada, Taihei; ; Yokomizo, Hideaki
JAERI-M 89-109, 63 Pages, 1989/08
no abstracts in English
Saigusa, Mikio; ; ; ; ; ; ;
JAERI-M 84-187, 19 Pages, 1984/10
no abstracts in English
;
Phys.Fluids, 8(2), p.378 - 383, 1965/00
Times Cited Count：15no abstracts in English
Anada, Keito*; Oishi, Yuji*; Serizawa, Hiroyuki; Kaji, Yoshiyuki; Muta, Hiroaki*; Kurosaki, Ken*; Yamanaka, Shinsuke*
no journal, ,
Polyhedral cavities which is called image crystal were observed in the Cerium Oxide sample sintered under reducing atmosphere. The facet became clear with decreasing O/M ratio which facilitates the atomic diffusion rate. This result suggests that the atomic diffusion rate of matrix significantly affects the formation of the image crystals.
Serizawa, Hiroyuki
no journal, ,
My investigation on the cavity in ceramics was triggered by the unexpected discovery of a polyhedral cavity in a UO matrix. The SEM image that fixed my eye's was a cavity found in the fracture surface of single crystal UO that was heat treated in helium at 90 MPa, followed by annealing at 1573 K for 1 h. It was clear that the cavity was a negative crystal which was formed by the precipitation of helium during the heat treatment after HIP injection. In a series of experiments, I noticed that the shape of cavity, when we use the helium injection method, the shape can easily be controlled. Our research team named the shape controlled negative crystal an image crystal. At this moment, we found three types of the image crystal formed in UO. We examined another research on the formation of the image crystal in CeO. I confirmed that nanosized image crystal is formed in the matrix.
