MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Bulk Glassy Co43Fe20Ta5.5B31.5 Alloy with High Glass-Forming Ability and Good Soft Magnetic Properties
Baolong ShenHisato KoshibaAkihisa InoueHisamichi KimuraTakao Mizushima
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2001 Volume 42 Issue 10 Pages 2136-2139

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Abstract

A new Co-based bulk glassy alloy Co43Fe20Ta5.5B31.5 exhibiting a large supercooled liquid region before crystallization and good soft magnetic properties was synthesized by the copper mold casting method. The glass transition temperature (Tg) is 910 K and the supercooled liquid region (ΔTx) reaches 70 K . The high thermal stability of the supercooled liquid enabled us to produce bulk glassy alloys with diameters up to 2 mm. These bulk glassy alloys exhibit good soft magnetic properties, i.e., saturation magnetization of 0.5 T, very low coercivity of 0.9 A/m and very high permeability of 40000 at 1 kHz. It is noticed that the diameter of 2 mm is the largest value for Co-based bulk glassy alloys reported up to now. The success of forming the large-scale size Co-based bulk glassy alloy with high thermal stability of supercooled liquid and good soft magnetic properties is encouraging for future uses of bulk amorphous soft magnetic materials.

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© 2001 The Japan Institute of Metals and Materials
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