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Terauchi, Masami*; Koike, Masato
no journal, ,
Characterization with nm-scale spatial resolution is important for developments of new functional materials. Information of electronic structure of valence electrons (bonding electrons) is imperative for characterizing a material. A soft-X-ray emission spectroscopy (XES) instrument for a transmission electron microscope (TEM) presented us that a density of states (DOS) of the valence band can be obtained from a specified small specimen area. A project to improve the spectrometer to attach to a conventional analytical TEM has been conducted by using a multilayer-coated VLS grating for the high dispersion type spectrometer. Pt M-emission spectrum showed two peaks of M
(2050eV) and M
(2127eV). A FWHM value of the M peak was 13 eV.
Yamashita, Shinichiro; Akasaka, Naoaki; Nishinoiri, Kenji; Takahashi, Heishichiro
no journal, ,
A modified SUS316 stainless steel (PNC316) for high burn-up fast reactor core application has been successfully developed. The material has a typical composition of 16Cr-14Ni-2.5Mo-0.25P-0.004B-0.1Ti-0.1Nb and is used in the 20% cold-worked condition. To demonstrate irradiation performance of PNC316 cladding irradiation experiments has been successively carried out at the temperature ranging from 775 K to 905 K up to a maximum dose of 125 dpa. In this study, the microstructures of the irradiated specimens were carefully examined. Low-magnification image including some of needle-like precipitates indicates many helium bubbles attaching at the precipitate interface. On the other hand, a representative high-resolution image of the needle-like precipitate with the sizes of a few tens of nanometers long and a few nanometers wide shows a distinct interface structure between FCC matrix and the precipitate. As the results of diffraction pattern and image analyses this characteristic precipitate was identified as Fe
P phase. Based on the numerous results of TEM examination, it is found that a significant improvement in the swelling resistance of PNC316 was mainly derived from the formation of a stable phosphide that traps helium bubbles and retards the conversion of bubbles to voids.