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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.8 (2002)  >  pp.1974-1978

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Thermal Stability and Soft Magnetic Properties of (Fe, Co)-(Nd, Dy)-B Glassy Alloys with High Boron Concentrations

Wei Zhang1), Yi Long2), Muneyuki Imafuku1) and Akihisa Inoue1)3)
1) Inoue Superliquid Glass Project, Exploratory Research for Advanced Technology,Japan Science and Technology Corporation
2) School of Materials Science and Engineering, University of Science and Technology Beijing
3) Institute for Materials Research, Tohoku University

Fe-based glassy alloys with high boron concentrations in (Fe, Co)–(Nd, Dy)–B system were found to exhibit a large supercooled liquid region (ΔTx) and good soft magnetic properties. The Fe62Co9.5Nd3Dy0.5B25 glassy alloy with ΔTx of 56 K exhibits high saturation magnetization (Is) of 1.41 T, low coercive force (Hc) of 2.6 A/m and large permeability (μe) at 1 kHz of 12000. The Fe62Co9.5Nd3Dy0.5B25 glassy alloy rods were produced in the diameter range up to 0.75 mm by copper mold casting. The substitution of 2 at% elements TM (TM=Nb, Ta, Mo and W) for Fe and Co, remarkably increases the ΔTx and TgTl, leading to an increase in the glass-formation ability (GFA) for Fe60.3Co9.2Nd3Dy0.5B25TM2. The ΔTx and TgTl increase from 56 to 87 K and 0.56 to 0.57, respectively, and the glassy alloy rods were produced in the diameter range up to 1.2 mm. The saturation magnetization Is decreases slightly, while the coercive force Hc remains almost unchanged by the addition of 2 at% TM elements.

iron-based bulk glassy alloy, iron-cobalt-rare earth-boron system, high boron concentration, transition metal, supercooled liquid region, glass-forming ability, soft magnetic properties

Received: February 25, 2002
Accepted: April 22, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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