Influence of thermal history on the crystallization behavior of high-Bs Fe-based amorphous alloys

A crucial step in creating cutting-edge soft magnetic alloys is the nanocrystallization of Fe-based amorphous alloys. However, it is unclear how the thermal history affects the nanocrystallization. In this work, high-precision nanocalorimetry and in-situ high-temperature transmission electron microscopy are used to systematically examine how the pre-annealing relaxation process affects the nanocrystallization of Fe-based amorphous alloys. We discover that the glass with more thermal energy storage will crystallize into superb nanocrystalline structures with exceptionally advanced soft magnetism. The soft magnetic properties of Fe-B nanocrystalline alloys can be improved by increasing the relaxation temperature. This finding provides solid and clear evidence for the influences of thermal history on crystallization behavior for Fe-based amorphous alloys, which is helpful for designing advanced soft magnetic nanocrystalline alloys.