Precipitation of α-Fe from Fe84−xSi4B12+x (x = 1, 3) Amorphous Alloys Under High Magnetic Field Annealing

Abstract

This work aims to investigate the effects of high magnetic field annealing (HMFA) on the precipitation of α-Fe from Fe 84−x Si 4 B 12+x (x = 1, 3) amorphous precursors. Isothermal annealing process for Fe 81 Si 4 B 15 and Fe 83 Si 4 B 13 amorphous ribbons has been performed with and without the magnetic field. The magnetic field shows the effects of increasing the nucleation rate and decreasing the grain size of α-Fe crystals simultaneously, during the crystallization processes of the investigated amorphous alloys. By applying HMF, α-Fe crystals with more homogeneous distribution and smaller grain size are achieved in the amorphous matrix, which is crucial helpful to improve the magnetic properties for Fe-Si-B amorphous alloys. The mechanism of HMFA affecting the crystallization microstructure is also discussed in the present work.