Optimum Soft Magnetic Properties of the FeSiBNbCu Alloy Achieved by Heat Treatment and Tailoring B/Si Ratio

Jonghee Han,Seoyeon Kwon,Sungwoo Sohn,Haein Choi-Yim,Jan Schroers

doi:10.3390/met10101297

Jonghee Han, Seoyeon Kwon + Show 3 more

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https://doi.org/10.3390/met10101297

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Journal: Metals	Publication Date: Sep 28, 2020
Citations: 9	License type: CC BY 4.0

Affiliation: Sookmyung Women's University, Yale University

Abstract

To increase the saturation magnetization (Ms) of commercially available soft magnetic Finemet alloys to the level comparable to that of Si-steel and Fe-based nanocrystalline alloys such as Nanoperm, Nanomet, the B or Si content in combination with annealing heat treatment was tailored. The ribbons of Fe95−xSi1BxNb3Cu1 (x = 11, 12, 13) and Fe87−xSixB9Nb3Cu1 (x = 6, 8, 10) were prepared by melt-spinning and annealed at different temperatures to develop nanocrystalline microstructure optimizing the soft magnetic properties. The magnetic properties of the as-spun and annealed ribbons were measured using a vibrating sample magnetometer and AC B-H loop tracer to acquire Ms of above 1.4 T in all as-spun ribbons. Among the alloys, Fe84Si1B11Nb3Cu1 annealed at 545 °C showed the highest Ms of 2 T, which exceeds that of the conventional Finemet and other Fe-based nanocrystalline alloys.

Highlights

Due to their superior soft magnetic properties, magnetic materials such as Si-steel have been widely used to produce actuators, sensors, transformer cores, or electric motors [1,2]
Theseof values ofPμcvr are superior soft magnetic properties compared to the conventional value of Finemet
Soft magnetic properties of Fe95−x Si1 Bx Nb3 Cu1 (x = 11, 12, 13) and Fe87−x Six B9 Nb3 Cu1 (x = 6, 8, 10) alloys were investigated by tailoring B or Si content ratio

Summary

Introduction

Due to their superior soft magnetic properties, magnetic materials such as Si-steel have been widely used to produce actuators, sensors, transformer cores, or electric motors [1,2]. Fe-based soft magnetic or nanocrystalline alloys could be a strong candidate for the emerging engineering technologies thanks to their potential for low Pcv and sufficient mechanical properties [4,5,6]. Improving the soft magnetic properties of the alloys to keep Pcv low and, at the same time, to increase Ms to the level exceeding that of Si-steel is required for the development of next-generation soft magnetic materials. High soft magnetic properties in these alloys are originated from the precipitation of nanocrystalline α-Fe dispersed in an amorphous matrix [8,9,10,11]

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