Nanocrystallization and soft magnetic properties of Fe_(23)M_6 (M: C or B) phase in Fe-based bulk metallic glass

摘要

Nanocrystallization effect of primary Fe_(23)M_6-type phase (M: C or B) on magnetic properties of Fe-based bulk metallic glass (BMG) has been investigated. Under controlled microstructural modification with Fe_(23)M_6-type phase, the soft magnetic properties of Fe_(76.5)C_6Si_(3.3)B_(5.5)P_(8.7) (at.%) BMG were significantly improved: saturation magnetization (M_s) and initial permeability (μj) of the alloy were dramatically enhanced from 1.35 T and 3500 to 1.57 T and 9890, respectively. The present study about introducing medium range atomic orderings and nanocrystallization of Fe_(23)M_6-type structure in amorphous matrix suggests a strategy to enhance the soft magnetic properties of ferromagnetic BMGs having the primary crystallized phase Fe_(23)M_6. This result provides useful insight to develop soft magnetic nanocrystalline materials, stating from BMG precursor with large glass forming ability.