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JAEA Reports

The Acceleration factor and inhibitor of the generation and growth of the cavity at high temperature; Computer simulation on growth of cavity

; 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.

JAEA Reports

Post-lrradiation examination on Fe-15Cr-20Ni series model alloy irradiated by CMIR-2(1); Effect of defect sink and size of solute atom on radiation induced segregation(1)

; Yamagata, Ichiro; Donomae, Takako; Akasaka, Naoaki

JNC TN9400 2000-046, 24 Pages, 2000/02

JNC-TN9400-2000-046.pdf:1.1MB

lt is well known that solute atoms are segregated on surface, grain boundary, etc. and composition changed partially in irradiated austenitic stainless steel. For understanding radiation induced segregation (RIS), we adopt a Fe-15Cr-20Ni-x (x: Si, Mo) which is basically alloy system in PNC1520, and size of Si, Mo are different from matrix atoms to investigate RIS behaviors. The specimens were irradiated by "Joyo" fast reactor that irradiation condition is 3.5 $$times$$ 10$$^{26}$$ n/m$$^{2}$$ (E>0.1Mev) at 476$$^{circ}$$C. After irradiation, the specimen were observed and analyzed with EDS (Energy Dispersive X-ray Spectroscope) of 400kV TEM (Transmission Electron Microscope). The behavior of RIS depends on size of solute atoms of alloy. For example, oversized atoms are decreased and undersized atoms are increased in sink. RIS of voids are as same as or more than grain boundaries and smaller than precipitates. The void denuded zone was existed nearby G.B. in case of combinations between the grains from G.B.0ne of the reasons in this, the voids swepted by moving G.B. in radiation induced G.B. migration.

Journal Articles

Grain size effect on tritium release from neutron irradiated beryllium

Ishitsuka, Etsuo; Kawamura, Hiroshi; Terai, Takayuki*; Tanaka, Satoru*; Uda, Minoru*

Fusion Technology 1998, 2, p.1281 - 1284, 1998/00

no abstracts in English

Journal Articles

In-situ observation of the motion and growth of He bubbles in matrix and along grain boundaries in Al

Ono, K.*; Furuno, Shigemi; Hojo, Kiichi; *

Microstructures and Functions of Materials (ICMFM 96), 0, p.273 - 276, 1996/00

no abstracts in English

Journal Articles

Enhancement of the transport critical current density by electron irradiation in a Bi$$_{1.5}$$Pb$$_{0.5}$$Sr$$_{2}$$Ca$$_{2}$$Cu$$_{3}$$O$$_{x}$$ ceramic

Shiraishi, Kensuke; *; *; *

Japanese Journal of Applied Physics, 31(12A), p.L1675 - L1678, 1992/12

https://doi.org/10.1143/JJAP.31.L1675
 Times Cited Count：0 Percentile：0(Physics, Applied)

no abstracts in English

Journal Articles

Electron irradiation effects on the transport critical current density in a Bi$$_{1.5}$$Pb$$_{0.5}$$Sr$$_{2}$$Ca$$_{2}$$Cu$$_{3}$$O$$_{x}$$ ceramic

*; *; *; *

Japanese Journal of Applied Physics, 31(8A), p.L1037 - L1040, 1992/08

https://doi.org/10.1143/JJAP.31.L1037
 Times Cited Count：5 Percentile：32.8(Physics, Applied)

no abstracts in English

Journal Articles

Effects of grain sizes on the lattice parameter changes in ThO$$_{2}$$ fuel kernels irradiated by fission fragments

; Akabori, Mitsuo; Shiba, Koreyuki

Funtai Oyobi Fummatsu Yakin, 30(5), p.178 - 183, 1983/00

https://doi.org/10.2497/jjspm.30.178

no abstracts in English

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