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JAEA Reports

Multi-scale analysis of deformation behavior at SCC crack tip (Contract research)

Kaji, Yoshiyuki; Miwa, Yukio; Tsukada, Takashi; Hayakawa, Masao*; Nagashima, Nobuo*; Matsuoka, Saburo*

JAERI-Research 2005-029, 156 Pages, 2005/09

JAERI-Research-2005-029.pdf:57.24MB

This report describes a result of the research conducted under contract with JNES that was concerned with a multi-scale analysis of plastic deformation behavior at the crack tip of SCC. The research was carried out to evaluate the validity of the SCC growth data acquired in the IGSCC project based on a mechanistic understanding of SCC. For the purpose, in this research, analyses of the plastic deformation behavior and microstructure around the crack tip were performed in a nano-order scale. The hardness measured in nano, meso and macro scales was employed as a common index of the strength, and the essential data necessary to understand the SCC propagation behavior were acquired and analyzed that are mainly a size of plastic deformation region and a microstructural information in the region, e.g. data of crystallografy, microscopic deformation and dislocations at the inside of grains and grain boundaries.

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

https://doi.org/10.1016/j.jnucmat.2004.01.010
 Times Cited Count：4 Percentile：29.26(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.

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