Nanocrystallisation of Soft Magnetic Fe--Co--Zr--Cu--B Alloys
A. Wlazłowska, J. Ferenc, J. Latuch and T. Kulik
Faculty of Materials Science, and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland
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In the present study, Fe41Co41B10Zr7Cu1 alloy has been investigated in order to evaluate its thermal stability and structure after heat treatment, as well as the impact of heat treatment on magnetic properties. X-ray diffractometry, differential scanning calorimetry, chemical composition microanalysis, transmission electron microscopy, and magnetic hysteresis loop measurement techniques were employed. The crystallisation temperature of the as-quenched alloy is 490°C (continuous heating at 5°C/min). The melt-spun ribbon having 27μm in thickness was annealed for 1 hour at temperatures from 400 to 700°C. The alloy after treatment at about 550°C underwent primary crystallisation, with the average size of crystals under 20 nm. This specimen shows the coercive field of 38 A/m, as compared to about 160 A/m reported for a similar alloy (Fe44Co44B4Zr7Cu1) with a similar structure, annealed at 600°C.
DOI: 10.12693/APhysPolA.102.323
PACS numbers: 61.43.Dq, 75.50.Bb, 75.50.Kj, 75.60.Ej, 81.05.Kf, 81.10.Jt, 81.70.Ex, 81.70.Pg