| 研究実績の概要 |
The TEM microstructure observation focused on dispersed Y-Zr oxide particles inside the single-layer alumina scale was conducted. The Y-Zr-O dispersoids show two shapes, i.e., a common spherical shape, and another unique tadpole-like shape. The formation mechanism was interpreted to be related with a diffusion of the Y/Zr ions driven by the oxygen potential gradient across the alumina scale. Based on the investigation on the oxidation behavior of FeCrAl ferritic ODS alloys, a suitable pre-oxidation condition was obtained. Alumina scale with 0.5um-1.5um thickness were successfully prepared, in which dense Y-Zr oxide particles were dispersed. The pre-oxidized specimens were irradiated with 6.4 MeV Fe3+ at 500oC up to a damage of 3 dpa at the DuET facility in Kyoto University. Both cross-sections and surfaces of the oxidized samples were irradiated. Based on SEM/EPMA characterization, a reliable stability can be confirmed in the Y-Zr dispersed alumina scale.
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