| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
Ultrasonic irradiation was applied to a supercooled droplet (FeSiBP(Cu) alloy) to induce intentional forced nucleation during the drop-tube quenching, resulting in the success of fabrication of iron-based rapid solidification particles with uniformly dispersed nanocrystalline nuclei in the amorphous matrix (nanohetero-structure). The nanostructure of the obtained particles after heat treatment was observed by transmission electron microscopy (TEM), and it was confirmed that a nanostructure with uniformly dispersed nanocrystalline phases of several nm grain size (less than 5 nm) was obtained. The magnetic properties of the single particles showed that the saturation magnetic flux density of iron-based amorphous particles quenched under ultrasonic irradiation was significantly higher than that without irradiation．
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