Soft-magnetic properties of Cu-free, Fe-based nanocrystalline alloys

A. Inoue, A. Makino, T. Masumoto

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


The objective of this paper is to review our recent results on the development of a new soft magnetic material with high saturation magnetization (Bs) in simple Fe-based alloy systems. A nanoscale bcc phase with an average grain size of 15 nm surrounded by a small amount of an amorphous phase was found to form by annealing amorphous Fe-Zr-B, Fe-Hf-B and Fe-Nb-B alloys. The high permeability above 10000 at 1 kHz combined with high Bs above 1.5 T was obtained for the bcc alloys. Magnetostriction (λs) decreases rapidly by the transition from amorphous to bcc phase and is of the order -1×10-6 for the bcc alloys. The small λs as well as the small grain size is concluded to be the reason for the good soft magnetic properties. The bcc Fe89Hf7B4 alloy also shows the low core loss of 0.066 W/kg at 1 T and 50 Hz, which is much smaller than those of amorphous Fe-Si-B alloys in practical uses as core materials in transformer. The newly developed Fe-based alloys are highly expected to be used as various kinds of soft magnetic materials.

Original languageEnglish
Pages (from-to)497-506
Number of pages10
JournalMaterials Science Forum
Publication statusPublished - 1995
EventProceedings of the International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials - Grenoble, Fr
Duration: 1994 Jun 271994 Jul 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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