Soft magnetic Co-based bulk metallic glasses (BMGs) with large supercooled liquid region (ΔT_x) and high saturation magnetic flux density (B_s) have been developed in a new Co–Fe–Y–B alloy system. Addition of appropriate contents of Y and Fe into a Co₇₅B₂₅ alloy enlarges the ΔT_x and improves the glass-forming ability (GFA). ΔT_x of 50–64 K and a critical diameter of up to 2.0 mm have been achieved for the (Co_0.5–0.7Fe_0.3–0.5)_71.5Y_3.5B₂₅ BMGs. The coercivity (H_c) of Co_75-xY_xB₂₅ and (Co_0.7Fe_0.3)_75-xY_xB₂₅ (x = 0–5) alloy series shows a similar V-shape change with Y content, and gets the minimum at x = 3.5, while that of (Co_1-yFe_y)_71.5Y_3.5B₂₅ (y = 0–0.5) alloys keeps rising with the increase of Fe content. The B_s of the alloys monotonically decreases with more Y addition and increases with enriching of Fe. The (Co_0.5–0.7Fe_0.3–0.5)_71.5Y_3.5B₂₅ BMGs exhibit high B_s of 1.00–1.17 T and low H_c of 5.4–6.4 A/m. The BMGs possess high yield strength of 3978–4152 MPa with distinct plastic strain of up to 0.9% and Vickers hardness of 1218–1233 as well. The possible mechanisms of Y and Fe affecting the GFA, thermal stability, and magnetic properties of the Co-based Co–Fe–Y–B metallic glasses have been discussed.

在新的Co–Fe–Y–B合金系统中，已经开发出具有大的过冷液体区域（ΔT _x）和高饱和磁通密度（B _s）的软磁Co基块状金属玻璃（BMG）。在Co ₇₅ B ₂₅合金中添加适当含量的Y和Fe可增加ΔT _x并改善玻璃形成能力（GFA）。Δ Ť _X 50-64的K和高达2.0mm的临界直径已被用于（共实现_0.5-0.7的Fe _0.3-0.5）_71.5 Ý _3.5乙₂₅非晶合金。Co的矫顽力（H _c）_75-x Y _x B ₂₅和（Co _0.7 Fe _0.3）_75-x Y _x B ₂₅（x = 0-5）合金系列显示出类似的V形随Y含量的变化，并在x = 3.5时达到最小值， （Co _1-y Fe _y）_71.5 Y _3.5 B ₂₅（y = 0-0.5）合金的含量随着Fe含量的增加而不断提高。所述乙_小号合金的单调以上的Y加法和增加与铁的富集减小。（Co _0.5-0.7 Fe _0.3-0.5）_71.5 Y _3.5 B_25个BMG具有1.00–1.17 T的高B _s和5.4–6.4 A / m的低H _c。BMG具有3978–4152 MPa的高屈服强度，高达0.9％的独特塑性应变以及1218–1233的维氏硬度。讨论了Y和Fe影响Co基Co-Fe-Y-B金属玻璃的GFA，热稳定性和磁性能的可能机理。