Crystallization kinetics of high iron concentration amorphous alloys under high magnetic fields

•Differential thermal analysis is carried out in up to 20 T.•The interval of the crystallizations increased in high magnetic fields.•Two types magnetic field effects are competing in high magnetic fields.•In-field crystallization can lead the ideal texture of nano-crystalline alloys.

Crystallization kinetics of a Fe83.3Si4.2B12.5 amorphous alloy and a Fe83.3Si4B8P4Cu0.7 hetero-amorphous alloy under magnetic fields was investigated by the differential thermal analysis (DTA). In DTA for Fe83.3Si4.2B12.5, the first crystallization peak, which indicates the precipitation of bcc-Fe shifts about 10 K toward the lower temperature side, whereas the second peak which indicates the precipitation of iron-compounds, shifts about 4 K toward the higher temperature side by applying a magnetic field of B = 20 T. On the other hand, in the case of Fe83.3Si4B8P4Cu0.7, the first peak at B = 20 T does not change in comparison with that at a zero magnetic field, whereas the second peak shifts toward a higher temperature side as well as Fe83.3Si4.2B12.5.