Fe- and Co-based nanocrystalline soft magnetic alloys modified with Hf, Mo, and Zr: magnetic properties, thermal stability, and structure. Alloys [.sub.88][Hf.sub.7] [B.sub.4][Cu.sub.1]

• Published in: Physics of metals and metallography 2013-02, Vol.114 (2), p.129
• Main Authors: Dmitrieva, N.V, Lukshina, V.A, Volkova, E.G, Potapov, A.P, Gaviko, V.S, Filippov, B.N
• Format: Article
• Language: English
• Subjects: Anisotropy; Cobalt; Magnetic alloys; Magnetic properties; Magnetization; Specialty metals industry; Zirconium
• ISSN: 0031-918X
• DOI: 10.1134/S0031918X13020051

Nanocrystalline alloys [([Fe.sub.0.6][Co.sub.0.4]).sub.86][Hf.sub.7] [B.sub.6][Cu.sub.1] and [([Fe.sub.0.7][Co.sub.0.3]).sub.88][Hf.sub.7] [B.sub.4][Cu.sub.1] have been investigated to obtain materials with improved thermal stability and new features. In order to make the alloys produced by melt quenching on a rotating wheel nanocrystalline, they have been subjected to heat (HT) and thermomechanical (TMechT) treatments. The effect of HT and TMechT conditions on the magnetic properties, thermal stability, and structure of the alloys has been studied. The optimal HT conditions for obtaining the minimum values of the coercive force ([H.sub.c]) in the alloys have been determined. It is shown that TMechT of the alloys leads to the induced longitudinal magnetic anisotropy with the axis of easy magnetization along the long side of the ribbon in the studied temperature range of 520-620°C. It has been established that the alloys [([Fe.sub.0.6][Co.sub.0.4]).sub.86][Hf.sub.7] [B.sub.6][Cu.sub.1] and [([Fe.sub.0.7][Co.sub.0.3]).sub.88][Hf.sub.7] [B.sub.4][Cu.sub.1] are thermally unstable at temperatures above 500°C. Keywords: Fe- and Co-based nanocrystalline alloys, magnetic properties, thermal stability, electron microscopy, X-ray diffraction, magnetic anisotropy