| 摘要 |
<p>Conventional Co-Fe-B-Si metallic glasses have poor glass forming capability, so that metallic glass rods with a thickness of at least 1 mm cannot be fabricated and practical utility thereof is limited. The development of superior soft magnetic Co-Fe-B-Si metallic glass from which a bulk metallic glass can be obtained is the key to greatly widen the field of application of metallic glass products. A soft magnetic Co-based metallic glass alloy of high glass forming capability characterized by being represented by the following composition formula and exhibiting a supercooled liquid temperature gap (ΔTχ) of 40 K or higher, a reduced vitrification temperature (Tg/Tm) of 0.59 and a coercive force of as low as 2.0 A/m or less. [Co1-n-(a+b)FenBaSib]100-χMχ wherein each of a, b and n represents an atomic ratio; 0.1 ≤ a ≤ 0.17; 0.06 ≤ b ≤ 0.15; 0.18 ≤ a+b ≤ 0.3; 0 ≤ n ≤ 0.08; M represents at least one element selected from among Zr, Nb, Ta, Hf, Mo, Ti, V, Cr, Pd and W; and 3 atomic% ≤ χ ≤ 10 atomic%.</p> |
