Abstract
Glassy alloys with a wide supercooled liquid region before crystallization were found in melt-spun Fe 56Co 7Ni 7Zr 2M 8B 20 (M = Nb or Ta) alloys. The temperature interval of the supercooled liquid region defined by the difference between glass transition temperature (T g) and crystallization temperature (T x), ΔT x(=T x-T g) is about 60 K for these alloys. The crystallization occurs through distinct two stages. The crystallization behavior seems to reflect the existence of Fe 2(M,Zr) phase resulting from the weaker bonding nature of Fe-M pair as compared with Fe-Zr pair. Good soft magnetic properties are obtained in the annealed state for 300s at 800K below T g for these alloys. Saturation magnetization (I s), coercive force (H c) and effective permeability ( μ e ) at 1 kHz are about 0.8T, 2A/m and 18000, respectively. The above-mentioned glassy alloys with wide supercooled liquid region and good soft magnetic properties have a strong possibility of producing soft magnetic bulk amorphous alloys.
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