4.8 Article

Design of Fe-based nanocrystalline alloys with superior magnetization and manufacturability

Journal

MATERIALS TODAY
Volume 42, Issue -, Pages 49-56

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mattod.2020.09.030

Keywords

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Funding

  1. National Key Research and Development Program of China [2016YFB0300500]
  2. National Natural Science Foundation of China [51601206, 51771159]
  3. CityU grants in Hong Kong [9360161, 9680218]

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A revolutionary nanostructure design concept was proposed in this study to improve the magnetic properties of Fe-based alloys by preforming dense nuclei and refining nano-structure via transient metalloid-rich interfaces. A novel alloy composition with superior magnetic properties was developed using only 4.6 wt.% light metalloids, showing great potential as a substitute for commercial bulk Si-steels in soft-magnetic applications.
Fe-based alloys with a nanocrystalline-amorphous nanostructure exhibit superior soft-magnetic performances; however they generally suffer from the low magnetization because of their heavy doping for an acceptable manufacturability. In this study, we proposed a revolutionary nanostructure-construction concept based on preforming dense nuclei in the melt-quenching process with a critical cooling-rate and refining the nano-structure via transient metalloid-rich interfaces. A novel alloy composition of Fe85.5B10Si2P2C0.5 was developed via our multi-metalloid stabilization and critical formability strategies by using a total of only 4.6 wt. % light metalloids. This unique alloy design effort leads to unprecedented magnetic properties with the super-high B-s of 1.87 T and mu(e) of 1.0-2.5 x 10(4), which outperform all commercial counterparts and have a high potential to substitute for commercial bulk Si-steels currently used for soft-magnetic applications. This hetero-structuring and lean-alloying strategy provides a paradigm for the next-generation of magnetic materials.Y

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