High Saturation Magnetization and Soft Magnetic Properties of bcc Fe-Zr-B Alloys with Ultrafine Grain Structure

K. Suzuki, N. Kataoka, A. Inoue, T. Masumoto, N. Kataoka, A. Inoue, T. Masumoto, A. Makino

Research output: Contribution to journalArticleResearchpeer-review

444 Citations (Scopus)


A new soft magnetic material exhibiting high magnetizations (B800) of 1.60 to 1.70 T under an applied field of 800 kA/m as well as high effective permeabilities (μe) of 13000 to 15000 at 1 kHz was produced in Fe-Zr-B alloys ranging from 5 to 7 at% Zr and 2 to 6%B. The material consists of a bcc phase produced by annealing the melt-spun Fe-Zr-B amorphous ribbons for 3.6 ks in the range of 873 to 923 K and the grain size is as small as 15 to 20 nm. The lattice parameter of the bcc phase is about 0.2870 nm which is larger than that of pure α-Fe. The crystallization-induced bcc phase is a metastable phase saturated with the solute elements and the annealing at temperatures above 973 K brings about a decomposition of the bcc phase to α-Fe and Fe3Zr, leading to a drastic decrease of μe. The bcc Fe-Zr-B alloys possess B800 and μe much higher than those of Fe-Si-B amorphous alloys and hence are highly attractive as a new soft magnetic material.

Original languageEnglish
Pages (from-to)743-746
Number of pages4
JournalMaterials Transactions, JIM
Issue number8
Publication statusPublished - 1 Jan 1990
Externally publishedYes


  • amorphous phase
  • crystallization
  • high saturation magnetization
  • iron-zirconium-boron alloy
  • permeability
  • soft magnetic property
  • ultrafine bcc phase

Cite this