A one-step fabrication of soft-magnetic high entropy alloy fiber with excellent strength and flexibility.
basic_science · Level V
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- Record sourced from PubMed, PMID 39632892.
- Also identified by DOI 10.1038/s41467-024-54984-7 and PMC identifier 11618367.
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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 Fe<sub>34</sub>Co<sub>29</sub>Ni<sub>29</sub>Al<sub>3</sub>Ta<sub>3</sub>Si<sub>2</sub> 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.