Nanocrystalline soft magnetic Fe-Si-B-P-Cu alloys with high B of 1.8-1.9T contributable to energy saving

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Melt-spun Fe 85Si 1-2B 8-11P 1-4Cu 1 alloys have unusual hetro-amorphous structures which can transfoto nanocrystalline structures composed of α-Fe grains with less than about 25 nm in size with crystallization. Especially, Fe 85Si 1-2B 8-11P 1-4Cu 1 nanocrystalline soft magnetic alloys prepared by crystallizing an as-quenched nanohetero-amorphous phase including a large amount of extremely small α-Fe grains (less than 2-3 nm in size) exhibit high B 800 of 1.8-1.9 T (at 800 A/m) almost comparable to those of commercial oriented silicon steels and significantly higher than those of non-oriented silicon steels, along with extremely low core loss (W) which is 1/2-1/3 smaller than that of the highest-grade oriented silicon steel and about one-order smaller than those of non-oriented silicon steels at maximum flux density of 1.7 T. The nanocrystalline alloys with lower materials cost due to absence of rare-metals are expected to not only contribute to significant energy-saving and reduction of CO 2 emission through reduction in W but also be useful to conserve the earth's resources and environment.

Original languageEnglish
Article number6172356
Pages (from-to)1331-1335
Number of pages5
JournalIEEE Transactions on Magnetics
Issue number4
Publication statusPublished - 2012 Apr


  • Excellent magnetic softness
  • Fe-Si-B-P-Cu nanocrystalline alloy
  • hetero-amorphous structure
  • high magnetic flux density

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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