Ma Yan, Kou Zongde, Yang Weiming, He Aina, Dong Yaqiang, Man Qikui, Liu Haishun, Li Zhiming, Inoue Akihisa, Li Jiawei
School of Mechanics and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, China.
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.
Nat Commun. 2024 Dec 4;15(1):10549. doi: 10.1038/s41467-024-54984-7.
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 FeCoNiAlTaSi 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.
软磁纤维（SMFs）在电子设备的能量转换、传输和存储中起着至关重要的作用。然而，传统的软磁纤维塑性较差，因此难以承受长期的拉伸、扭转和剪切变形。高比例的晶界可以提高传统软磁纤维的塑性变形能力，但会降低矫顽力。这严重限制了它们在柔性电子器件和多功能部件中的应用。在此，我们提出了一种克服这一困境的策略，该策略通过一种简单的一步旋转水纺丝方法，使含有有序相干纳米析出物且晶格失配小的FeCoNiAlTaSi高熵合金（HEA）纤维的晶粒粗化来实现。这有助于减少畴壁钉扎并提高位错迁移率。所得的微米级软磁高熵合金纤维在伸长率为23%时的抗拉强度为674 MPa，矫顽力低至8.1 Oe，在10 kOe时的中等磁化强度为116 emu/g，居里温度高达770 K。
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