Iron-based amorphous alloys have been a focus of considerable scientific
interest in recent years, both from fundamental and practical point of view.
Comprehensive study of Fe75Ni2Si8B13C2 amorphous alloy investigated its
thermal stability and thermally induced changes of the electrical, magnetic
and mechanical properties and correlated them with microstructural changes.
The alloy was investigated in 25-1000?C temperature range. Thermally induced
structural transformations had been investigated using the DSC and the
thermomagnetic measurements, revealing that the alloy exhibits the Curie
temperature, glass transition, multi-step crystallization and
recrystallization. The crystallization kinetics was determined, under
non-isothermal conditions, to include three processes, corresponding to
crystallization of ?-Fe, Fe3B and Fe2B phases, respectively. Microstructural
analysis using the XRD and the M?ssbauer spectroscopy suggests that Fe3B acts
as an intermediate in the formation of Fe2B. The microstructure was
investigated on both the surface of the alloy ribbon and on the
cross-section, using SEM to determine structural changes of the alloy after
thermal treatment. Additionally, the XRD spectra were analyzed to determine
the change in microstructural parameters of the alloy caused by the thermal
treatment and the structural transformations. The M?ssbauer spectroscopy was
used to determine the distribution of iron atoms between the individual
crystalline phases and the amorphous matrix. The functional properties were
investigated using measurements of the magnetic susceptibility, electrical
resistivity and microhardness and these results were correlated with changes
in the microstructural parameters (average crystalline size, microstrain) and
the phase composition. The measurements were performed, where possible, both
during heating cycles to observe the change of these properties with
temperature, and at room temperature, after individual heating cycles to
determine the change in properties caused by annealing at different
temperatures.
Influence of thermal treatment on structure and properties of Fe75Ni2Si8B13C2 amorphous alloy
