Thermal stability and soft magnetic properties of Fe-Nb-B amorphous alloys with high boron concentrations

被引：37

作者：

Itoi, T ^{[1
]}

Inoue, A ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

MATERIALS TRANSACTIONS JIM | 1999年 / 40卷 / 07期

关键词：

iron-based amorphous alloy; high boron concentration; glass transition; supercooled liquid region; soft magnetic property; multiphase crystallization;

D O I：

10.2320/matertrans1989.40.643

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ferromagnetic amorphous Fe-Nb-B alloys containing 30 at%B were found to exhibit a large supercooled liquid region with a temperature interval over 50 K before crystallization and the largest Delta T-x(=T-x-T-g) reaches 71 K for Fe62Nb8B30. The Delta T-x is strongly dependent on B content, while the soft magnetic properties of saturated magnetization (I-s), permeability (mu(e)) and saturated magnetostriction (lambda(s)) are dependent on Nb content. The Fe62Nb8B30 amorphous alloy exhibits good soft magnetic properties of 0.68 T for I-s, 2.6 A/m for coercive force (H-c), 19300 for mu(e) at 1 kHz and 7.7 x 10(-6) for lambda(s). The crystallization takes place through a single exothermic reaction, accompanying the simultaneous precipitation of the three crystalline phases of alpha-Fe, Fe2B and FeNb2B2. The crystallization mode which requires long-range atomic rearrangements plays a dominant role in achieving the high stability of the supercooled liquid against crystallization.

引用

页码：643 / 647

页数：5

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