Regular Article

Effect of stress relaxation on soft magnetic properties of Fe₇₆Si₉B₁₀P₅ metallic glass

¹ CAS Key Laboratory of Magnetic Materials and Devices, Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P.R. China
² School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, P.R. China
³ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P.R. China

^* e-mail: songlj@nimte.ac.cn

Received: 29 October 2022
Received in final form: 10 December 2022
Accepted: 10 January 2023
Published online: 30 March 2023

Abstract

Stress relief can improve the soft magnetic properties of Fe-based metallic glasses (MGs) and is vital for industrial applications. In this work, we investigated the evolution of soft magnetic properties, relaxation dynamics, and mechanical properties of Fe-based MGs under different applied tensile strains and stress relaxation times. We found that stress relaxation can significantly reduce coercivity H_c by 95% compared with as-quenched state. Furthermore, the coercivity H_c, apparent activation volume V_act and time constant t_r all show analogous two-stage variation with annealing time, accompanied by approximate crossovers. This suggests that the microstructure change emerges, further verified by the domain wall motion and the transition from elastic to plastic. These results are helpful in preparing Fe-based MGs with excellent soft magnetic and mechanical properties by controlling the stress relaxation condition.