Soft magnetic properties of bulk nanocrystalline Fe-(Zr,Hf)-B alloys produced by extruding amorphous powders

Akinori Kojima, Hidehiko Horikiri, Yoshihito Kawamura, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

Abstract

The Bulk Fe90Zr7B3 and Fe89Hf7B4 alloys were prepared by extruding amorphous powders through utilizing a softening phenomenon of an amorphous alloy near the crystallization temperature. The extruded bulk alloys are composed of an amorphous phase containing a small amount of bcc phase in an as-extruded state and the structure changes to a mostly single bcc phase with grain sizes from 10 to 25 nm by annealing at 923 K. The soft magnetic properties of the bulk alloys are better for the alloys containing a smaller volume fraction of bcc phase in as-extruded state. The Fe90Zr7B3 alloy extruded at pressure of 860 MPa and temperature of 673 K has a high relative density above 99 %, and exhibits the permeabilities (μe) of 2350, flux density (B800) of 1.59 T and the coercivity (Hc) of 26 A/m.

Original languageEnglish
Pages (from-to)127-132
Number of pages6
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume42
Issue number1
Publication statusPublished - 1996 Mar 1
Externally publishedYes

Keywords

  • Amorphous powder
  • Consolidation
  • High saturation magnetization
  • Nanocrystalline phase
  • Soft-magnetic properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys

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