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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.766-769

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Soft Magnetic Bulk Glassy Fe-B-Si-Nb Alloys with High Saturation Magnetization above 1.5 T

Akihisa Inoue1) and Baolong Shen1)
1) Institute for Materials Research, Tohoku University

New Fe-based bulk glassy alloys were synthesized in the (Fe0.75B0.15Si0.10)100−xNbx system by copper mould casting. The maximum diameter of the bulk glassy alloy rod was 0.5 mm at 1 at%Nb, 1.0 mm at 2 at%Nb and 1.5 mm at 4 at%Nb. No glass transition is observed at 0 at%Nb, but the addition of Nb causes the appearance of glass transition before crystallization. The glass transition temperature (Tg) and crystallization temperature (Tx) of the bulk glassy rods were 815 K and 858 K, respectively, for the 1 at%Nb alloy, and 835 K and 885 K, respectively, for the 4 at%Nb alloy. The reduced glass transition temperature (TgTl) defined by the ratio of Tg to the liquidus temperature (Tl) was measured as 0.56 at 1 at%Nb, 0.57 at 2 at%Nb and 0.61 at 4 at%Nb. There is a tendency for Tg, ΔTx (=TxTg) and TgTl to increase with increasing Nb content. The effect of Nb addition can be interpreted in the framework of the three component rules for the formation of bulk glassy alloys and the stabilization of supercooled liquid. The Fe–B–Si alloy satisfies the three component rules by the addition of Nb. The bulk glassy alloy rods exhibited good soft magnetic properties, i.e., high saturation magnetization (Is) of 1.47 to 1.51 T, low coercive force (Hc) of 2.9 to 3.7 A/m and Curie temperature of 593 to 684 K. The high Is and low Hc, as well as the formation of bulk glassy alloys in the simple alloy system are promising as a new type of soft magnetic bulk alloy.

iron-based alloy, bulk glassy alloy, copper mould casting, soft magnetic property, high saturation magnetization

Received: December 05, 2001
Accepted: February 25, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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