Preparation and Properties of FeZrB Amorphous-Nanocrystalline Soft Magnetic Alloy

Fe68Zr20B12 amorphous alloy was prepared by mechanical alloying(MA) method and annealed at different temperatures. Microstructures and magnetic properties of Fe68Zr20B12 alloys as-milled and annealed at 693, 843, 943 and 993 K were studied. The raw powders(Fe, Zr, B) formed b. c. c. alpha-Fe solid solution at early stages of MA and then transformed into amorphous alloy. Grain size(D) of Fe68Zr20B12 alloys increases with increasing annealing temperature and keeps at nanometer level. The specific saturation magnetization (sigma(s)) increases with increasing annealing temperature from 300 K to 943 K, and then decreases with annealing temperature at 993 K because of the precipitation of Fe3B.