Structure and magnetic properties of Fe62Co8-x (Cr, Mo)(x) Nb4Zr6B20 amorphous alloy with a wide supercooled liquid region

Fe62Co8-xCrxNb4Zr6B20 and Fe62Co8-xMoxNb4Zr6B20 (x = 0, 2, 4, atomic percen t) alloy series were chosen to study in this paper based on the three empir ical rules of making bulk amorphous alloy. The ribbons, 30 mum thick and 5m m. wide, were produced by single-roller rapid quenching. The thermal stabil ity, amorphous structure and magnetic properties of these alloys were studi ed by differential thermal analysis, X-ray diffraction, Faraday magnetic ba lance and static magnetic measurement. The supercooled liquid region DeltaT (x) of the alloy, which contains 2at% Cr, reaches 85K, but the saturation m agnetization sigma (s) of these alloys decreases distinctly with increasing Cr or Mo. The saturation magnetization sigma (s) and coercive force H-c in crease rapidly for the alloys of this series annealed at 973K for 900s beca use of the precipitation of alpha -Fe.