Structural and magnetic properties of nanocrystalline fe-rich fe-nb-nd-b sintered magnets produced by consolidating amorphous powders

A. Kojima, A. Makino, A. Inoue

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Nanocrystalline bulk Fe88Nb2Nd5B5 and Fe86Nb2Nd7B5 alloys were made by consolidating amorphous powders with an electric-pulse-currentsintering method and subsequent annealing. Bulk alloy made by consolidating amorphous powders has a higher density (the maximum density could reach 7.5 g/cm3 consolidating at 873 K and 636 MPa) than that made by consolidating crystalline powders, presumably because the amorphous alloy softens around the crystallization temperature. The structure formed after annealing at 1023 K for 180 s shows a nanocrys talline composite consisting of bcc-Fe, Nd2Fe14B and Fe3B or Fe2B phases with grain sizes of 20-40 nm The nanocrystalline bulk Fe88Nb2Nd5B5 alloy shows hard magnetic properties, remanence (Jr) of 1.05 T, coercive force (H0J) of 263 kA/m, and maximum energy product ((BH)max) of 75 kJ/m3.

Original languageEnglish
Pages (from-to)3817-3819
Number of pages3
JournalIEEE Transactions on Magnetics
Volume33
Issue number5 PART 2
DOIs
Publication statusPublished - 1997 Jan 1

ASJC Scopus subject areas

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

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