A one-step fabrication of soft-magnetic high entropy alloy fiber with excellent strength and flexibility

Yan Ma; Zongde Kou; Weiming Yang; Aina He; Yaqiang Dong; Qikui Man; Haishun Liu; Zhiming Li; Akihisa Inoue; Jiawei Li

doi:10.1038/s41467-024-54984-7

A one-step fabrication of soft-magnetic high entropy alloy fiber with excellent strength and flexibility

Nat Commun. 2024 Dec 4;15(1):10549. doi: 10.1038/s41467-024-54984-7.

Authors

Yan Ma^#^{1

2}, Zongde Kou^#³, Weiming Yang⁴, Aina He², Yaqiang Dong², Qikui Man², Haishun Liu⁵, Zhiming Li⁶, Akihisa Inoue⁷, Jiawei Li⁸

Affiliations

¹ School of Mechanics and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, China.
² 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, Zhejiang, China.
³ Herbert Gleiter Institute of Nanoscience, School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjin, China.
⁴ School of Mechanics and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, China. wmyang@cumt.edu.cn.
⁵ School of Materials and Physics, China University of Mining and Technology, Xuzhou, China.
⁶ School of Materials Science and Engineering, Central South University, Changsha, China.
⁷ International Institute of Green Materials, Josai International University, Togane, Japan.
⁸ 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, Zhejiang, China. lijw@nimte.ac.cn.

^# Contributed equally.

Abstract

Soft-magnetic fibers (SMFs) play a crucial role in energy conversion, transmission, and storage within electronic devices. However, conventional SMFs have poor plasticity and are therefore difficult to withstand long-term tensile, torsional, and shear deformation. A high fraction of grain boundaries could improve plastic deformability of conventional SMFs, but deteriorates the coercivity. This severely limits their applications in flexible electronics and multifunctional components. Herein, we propose a strategy to overcome this dilemma, which is realized by coarsening the grains of a Fe₃₄Co₂₉Ni₂₉Al₃Ta₃Si₂ high entropy alloy (HEA) fiber containing ordered coherent nanoprecipitates with small lattice misfit via a simple one-step in-rotating-water spinning method. This allows to reduce domain wall pinning and improve dislocation mobility. The resultant micron-diameter soft-magnetic HEA fiber has a tensile strength of 674 MPa at 23% elongation, a low coercivity of 8.1 Oe, a moderate magnetization of 116 emu/g at 10 kOe and a high Curie temperature of 770 K.

Grants and funding

52301158/National Natural Science Foundation of China (National Science Foundation of China)