Microstructure of Fe–Cu–Nb–Si–B Soft Magnetic Alloys Studied by Transmission Electron Microscopy

抄録

Microstructures of soft magnetic Fe_73.5CuNb₃Si_13.5B₉ alloys, which were rapidly solidified and then annealed at various temperatures, have been investigated by transmission electron microscopy. The as-quenched alloy shows a homogeneous amorphous structure without any microcrystalline regions. In the alloys annealed at around 550°C, which show the best soft magnetic properties, bcc crystalline grains with a global shape, about 20 nm in diameters, and amorphous regions surrounding them, were observed.