| 摘要 |
Disclosed is a soft magnetic Fe-B-Si-based metallic glass alloy with high glass forming ability which has a supercooled-liquid temperature interval (DeltaT<SUB>chi</SUB>) of 40 K or more, a reduced glass-transition temperature (T<SUB>g</SUB>/T<SUB>m</SUB>) of 0.56 or more and a saturation magnetization of 1.4 T or more. The metallic glass alloy is represented by the following composition formula: (Fe<SUB>1-a-b</SUB>B<SUB>a</SUB>Si<SUB>b</SUB>)<SUB>100-chi</SUB>M<SUB>chi</SUB>, wherein a and b represent an atomic ratio, and satisfy the following relations: 0.1<=a<=0.17, 0.06<=b<=0.15 and 0.18<=a+b<=0.3, M is one or more elements selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti, V, Cr, Pd and W, and chi satisfies the following relation: 1 atomic % <=chi<=10 atomic %. The present invention overcomes restrictions in preparing a metallic glass bar with a thickness of 1 mm or more from conventional Fe-B-Si-based metallic glasses due to their poor glass forming ability, and provides a high saturation-magnetization Fe-B-Si-based metallic glass allowing the formation of bulk metallic glass, which serves as a key technology for achieving a broader application fields of metallic glass products.
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