Crystallization kinetics and magnetostriction properties of amorphous Fe 80-x Co x P 14 B 6 metallic glasses

• Published in: Journal of magnetism and magnetic materials Vol. 512
• Main Authors: Grishin, Alexander M., Ignakhin, V. S., Lugovskaya, L. A., Osaulenko, R. N., Sekirin, I. , V
• Format: Journal Article
• Language: English
• Published: 15-10-2020
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2020.166972

Formation mechanism and crystallization kinetics were studied in series of rapidly solidified metallic glasses Fe 80- x Co x P 14 B 6 with x = 23, 25, 28, 32, 35 and 40 at.%. As soft magnetic materials, they surpass characteristics of commercial Iron-Nickel Metglas® 2826 alloy: differential permeability of as quenched amorphous ribbons is of about 110,000, the saturation induction μ o M s = 1.45–1.5 T, coercive field as low as 4 A/m, Curie temperature above 700 K, and significantly higher thermal stability. Isochronal and isothermal differential scanning calorimetry was employed to record the latent heat developed during crystallization. For both regimes, X-ray diffraction revealed two immiscible bcc α-FeCo and bct (Fe,Co) 3 (P,B) phases that crystallize from completely miscible amorphous glass matrix. Theoretical description of observed kinetics of crystallization process was convincingly accomplished within Kolmogorov-Johnson-Mehl-Avrami model. Enhanced thermal stability of iron-rich Fe 80- x Co x P 14 B 6 glasses that crystalize at higher temperatures relies upon higher crystal/glass interfacial energy.