| 摘要 |
Disclosed is a soft magnetic Co-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 0.59 and a low coercive force of 2.0 A/m or less. The metallic glass alloy is represented by the following composition formula: [Co<SUB>1-n-(a+b)</SUB>Fe<SUB>n</SUB>B<SUB>a</SUB>Si<SUB>b</SUB>]<SUB>100-chi</SUB>M<SUB>chi</SUB>, wherein each of a, b and n represents an atomic ratio satisfying the following relations: 0.1<=a<=0.17; 0.06<=b<=0.15; 0.18<=a+b<=0.3; and 0<=n<=0.08, M representing one or more elements selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti, V, Cr, Pd and W, and chi satisfying the following relation: 3 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 Co-Fe-B-Si-based metallic glasses due to their poor glass forming ability, and provides an excellent Co-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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