Abstract
In this work, fine Fe–Si powders with a nanocrystalline structure were prepared by mechanical alloying (high-energy ball milling) and subsequent heat treatment (in order to optimize their magnetic properties). Good soft magnetic properties were obtained in mechanically alloyed Fe–Si powders. The Fe 75Si 25 powder annealed at 450°C possessed a magnetization of 149 Am 2/kg and a coercivity of 0.2 kA/m. The coercivity model for soft magnetic nanocrystalline materials could be well applied to the Fe–Si powders in this work. The mechanically alloyed Fe–Si possessed significantly higher magnetic permeability than that of commercially available Fe–Si powder. The permeability of the mechanically alloyed Fe 75Si 25 powder was comparable with that of mechanically alloyed pure Fe powder. Considering of lower density and better chemical stability of Fe–Si, the mechanically alloyed Fe–Si may be interesting for soft magnetic application including magnetic shielding and electromagnetic noise suppression.
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