Abstract
After one of the B atoms in Fe73.5Cu1Nb3Si13.5B9 alloy was replaced by both 0.7 Si and 0.3 Co, Fe73.5Co0.3Cu1Nb3Si14.2B8 alloy ribbons were prepared by single roll fast quenching method. The obtained alloy ribbons were subsequently wound into ring magnetic cores, and then these magnetic cores were annealed at different temperatures in air. The effects of adding Co on the crystallization behavior and soft magnetic properties of the as-quenched alloy ribbons with and without heat treatment were studied. The results show that the amorphous structure of the prepared Fe73.5Co0.3Cu1Nb3Si14.2B8 alloy ribbons is transformed into the coexistence of amorphous and nanocrystalline structures after heat treatment at 550°C. Comparing with Fe73.5Cu1Nb3Si13.5B9 alloy ribbons, the first initial crystallization temperature (Tx1) and crystallization peak temperature (Tp1) of Fe73.5Co0.3Cu1Nb3Si14.2B8 alloy ribbons were reduced by 1.6 and 1.7°C, respectively, While the second initial crystallization temperature (Tx1) and crystallization peak temperature (Tp2) were increased by 6.5 and 5.7°C, respectively, resulting in that the difference between the first and the second initial crystallization temperatures (∆Tx) are increased by 8.1°C; the initial permeability (μi) and saturation induction density (Bs) of the amorphous/nanocrystalline Fe73.5Co0.3Cu1Nb3Si14.2B8 magnetic cores were reduced by 0.15 H/m and 0.39 T, respectively, while the coercivity (Hc) is increased by 0.34 A/m.
Highlights
Since a fast quenching process was employed to prepare the amorphous alloys by Klement et al in 1960 [1], it has been attracting more and more attention of researchers because of its unique structure, efficient preparation process, excellent material properties, and wide application prospects [2]
The amorphous soft magnetic alloy is mainly composed of Fe, Co, and Ni belonging to ferromagnetic metal elements, as well as Si, B, P, and C belonging to amorphous metal elements
A small amount of transitional elements or rareearth elements is usually added into the amorphous soft magnetic alloy [3, 4], to improve the ability and thermal stability of the amorphous alloy
Summary
Since a fast quenching process was employed to prepare the amorphous alloys by Klement et al in 1960 [1], it has been attracting more and more attention of researchers because of its unique structure, efficient preparation process, excellent material properties, and wide application prospects [2]. The various miniature sensors based on GMI have been applied in measurement of weak magnetic fields, detection of azimuth, and magnetic recording technology due to the advantages of this effect such as high sensitivity, small size, and fast response [9]. Both the high temperature properties and high frequency performance of the alloys can be improved by replacing Fe in finemet soft magnetic alloy with Co [10,11,12]. The direct-current (DC) soft magnetic properties of the amorphous/nanocrystalline cores, as well as the magnetic impedance effect of the amorphous/nanocrystalline strips, are investigated
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