Nanocrystalline (Fe,Co,Ni)86B14 soft magnetic alloys prepared by ultra-rapid annealing

• Published in: Journal of alloys and compounds Vol. 902; p. 162544
• Main Authors: Li, Z., Parsons, R., Kishimoto, H., Shoji, T., Kato, A., Karel, J., Suzuki, K.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05-05-2022; Elsevier BV
• Subjects: Alloy systems; Amorphous alloys; Annealing; Coercivity; Composition; Core loss; ferromagnetism; Glass; Glass formation; Iron; Magnetic alloys; Magnetic properties; Metallic glasses; nanocrystalline alloys; Nanocrystals; Nickel; soft magnetic materials; soft magnetic materials; ferromagnetism; nanocrystalline alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.162544

•Addition of Co and Ni reduces the glass-forming ability of (Fe1−x-yCoxNiy)86B14.•The bcc-fcc transition is observed in nanocrystalline (Fe1−x-yCoxNiy)86B14.•Hc of nanocrystalline (Fe1−x-yCoxNiy)86B14 is increased by Co, reduced by Ni.•Maximum Js of nanocrystalline (Fe1−x-yCoxNiy)86B14 of 1.98 T for (x, y) = (0.3, 0).•Nanocrystalline (Fe0.80Co0.05Ni0.15)86B14 shows a Hc of 2.0 A/m and Js of 1.71 T.
In this study, the glass-forming range, microstructural and soft magnetic properties of (Fe1−x-yCoxNiy)86B14 alloys were investigated in the as-cast state and after ultra-rapid annealing. The glass-forming range is seen to be the greatest for Fe-rich compositions and is limited to x ≤ 0.8 and y ≤ 0.3. Within the glass-forming range, this alloy system is observed to contain nano-scale grains with bcc and fcc structures after ultra-rapid annealing and a clear bcc-fcc transition is seen for Ni-rich compositions. Both the coercivity (Hc) and saturation magnetic polarization (Js) for the nanocrystalline (Fe1−x-yCoxNiy)86B14 alloys are generally increased by Co addition and reduced by Ni addition. Js is confirmed to be the largest for (Fe0.8Co0.2)86B14 at 1.88 T in the as-cast state and 1.98 T for (Fe0.7Co0.3)86B14 in the nanocrystalline state. The minimum Hc of 2.0 A/m is obtained for nanocrystalline (Fe0.80Co0.05Ni0.15)86B14 with a Js of 1.71 T. This composition also exhibits a lower core loss compared to the nanocrystalline Fe86B14 and Fe-based amorphous alloys at frequencies up to 1 kHz.