Hard magnetic properties of nanocrystalline Fe-rich Fe-Nb-Nd-B bulk alloys produced by consolidating amorphous powders

A. Kojima, A. Makino, A. Inoue

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Nanocrystalline bulk Fe88Nb2Nd5B5 and Fe76Co10Nb2Nd7B5 magnets were made by consolidating amorphous powders using an electric-pulse-current-sintering method and subsequent annealing. The bulk alloys made by consolidating amorphous powders have high densities of 7.65 - 7.7 × 103 kg/m3 despite the relatively low sintering temperature, presumably due to the high deformability of amorphous alloy near the crystallization temperature. The structure formed after annealing at 1023 K for 180 s shows a nanocrystalline composite consisting of bcc-Fe, Nd2Fe14B, and Fe3B or Fe2B phases with grain sizes of 20-40 nm. The nanocrystalline bulk Fe76Co10Nb2Nd7B5 alloy shows anisotropic hard magnetic properties and the maximum energy product (BH)max measured parallel to the press direction are 80 and 72 kJ/m3 for Fe88Nb2Nd5B5 and Fe76Co10Nb2Nd7B5, respectively.

Original languageEnglish
Pages (from-to)1015-1024
Number of pages10
JournalNanostructured Materials
Volume8
Issue number8
DOIs
Publication statusPublished - 1997 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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