Abstract
Soft magnetic properties of Fe-based metallic glasses (MGs) are dependent on their nanocrystallization behavior, particularly the precipitation of α-Fe embedded in the amorphous matrix. In this study, the effects of metalloid elements of C, B, Si, and P on thermal stability, nanocrystallization behavior, and soft magnetic properties of typical Fe-based amorphous alloys, i.e., the Fe-Cu-(CBSiP) glassy alloys, were investigated systematically. It is found that the addition of the metalloid elements can effectively retard the precipitation process of α-Fe during reheating of the Fe-based MGs due to the long-range diffusion of the metalloids; however, their individual effects on the compositional portioning and formation of other crystalline phases are varied. To achieve desirable soft magnetic properties, a species of metalloids and their concentrations have to be carefully controlled so that the formation of α-Fe does not interfere with that of other crystalline phases, especially those hard-magnetic phases.
Highlights
Fe-based metallic glasses (MGs) have attracted extensive attention due to their unique combination of good mechanical and soft magnetic properties [1,2,3,4,5]
Fe-based metallic glasses, nanocrystallization of α-Fe would occur, resulting in a composite structure consisting of ultrafine grains homogenously distributed in amorphous matrix
The coupling effect between α-Fe particles and the amorphous matrix, and the release of residual stress generated during preparation, tend to lead to better magnetic properties, including higher saturation magnetization
Summary
Fe-based metallic glasses (MGs) have attracted extensive attention due to their unique combination of good mechanical and soft magnetic properties [1,2,3,4,5]. Fe-based amorphous alloys and their composites have been developed, such as METGLAS, FINEMET, NANOPERM, HITPERM, and NANOMET [6,7,8,9,10]. Fe-based metallic glasses, nanocrystallization of α-Fe would occur, resulting in a composite structure consisting of ultrafine grains homogenously distributed in amorphous matrix. The coupling effect between α-Fe particles and the amorphous matrix, and the release of residual stress generated during preparation, tend to lead to better magnetic properties, including higher saturation magnetization. It was reported that to achieve desirable soft magnetic properties, the following aspects should be taken into account: Metals 2018, 8, 283; doi:10.3390/met8040283 www.mdpi.com/journal/metals
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