Abstract
New Fe-based glassy alloys in Fe–Co–Nd–Dy–B system with high boron concentrations were found to exhibit a wide supercooled liquid region exceeding 50 K. The high stability of the supercooled liquid enabled us to produce cylindrical bulk glassy alloys with diameters up to 0.75 mm by copper mold casting. The glass transition temperature (Tg), crystallization temperature (Tx), supercooled liquid region ΔTx (=Tx−Tg) and heat of crystallization of the φ0.75 mm rod of glassy Fe62Co9.5Nd3Dy0.5B25 alloy are 844 K, 899 K, 55 K and 4.46 kJ/mol, respectively. No appreciable difference in the thermal stability is seen between the bulk rods and melt-spun ribbon. The saturation magnetization (Is), coercive force (Hc), saturated magnetostriction (λs) and Curie temperature (Tc) of the melt-spun Fe62Co9.5Nd3Dy0.5B25 ribbon are 1.37 T, 4.58 A/m, 17.9×10−6 and 663 K, respectively, and Is and Tc are nearly the same as those for the bulk glass rods with diameters of 0.5 and 0.75 mm. The success of forming the Fe-based bulk glassy alloys exhibiting good soft magnetic properties is promising for future development as a new type of soft magnetic material.
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