Amorphous materials Cooling Crystallization Grain size and shape Magnetic anisotropy Magnetic permeability Magnetostriction Nanostructured materials Reaction kinetics Silver Substitution reactions Volume fraction X ray diffraction analysis Amosphous structures Crystallization kinetics Fluctuation length Grain diameter Heating rates Iron alloys
Issue Date:
2005
Publisher:
Journal of Magnetism and Magnetic Materials
Citation:
Volume 290-291 PART 2, Page 1547-1550
Abstract:
The amorphous ribbon Fe73.5Si13.5B9Nb 3Ag1 has been prepared by rapid cooling on a single
copper wheel. The DSC curves show the very sharp peak at 593-617 ?C depending on the heating rate from
10 ?C/min to 50 ?C/min, which is higher than that for pure Finemet (540-572 ?C, respectively). The
crystallization activation energy of ?-Fe(Si) phase has been determined and shown to be E=4.09eV, higher
than that of pure Finemet (E=3.25eV). After annealing at 550 ?C for 10 min, the crystallization volume
fraction of ?-Fe(Si) phase reaches the value of 78.4% with average grain size of 32 nm. The M(T)
measurement along cooling cycle exhibits clearly two-step curve corresponding to the multiphase structure
of the ribbon. The annealing of ribbon leads to the occurrence of nanocomposite state and improvement of
soft magnetic properties of the material. ?? 2004 Elsevier B.V. All rights reserved.
