Micro structure of nanocrystalline Fe-Nb-Pr-B alloys produced by crystallization of amorphous phase

Akinori Kojima, Fujiya Ogiwara, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The crystallization behavior and magnetic properties of the melt-spun amorphous Fe88Pr7B5, Fe88Nb2Pr5B5 and Fe86Nb2Pr7B5 alloys were investigated. These alloys have a nanocrystalline structure consisting of bcc-Fe, Fe14Pr2B and remaining amorphous phases and exhibit rather good hard magnetic properties, iHc of 210-270 kA m-1, Ir of 0.93-1.23 T, after annealing for 180 s at 923-1023 K. The Fe88Nb2Pr5B5 alloy exhibits the highest (BH)max of 110 kJ m-3 among the three alloys and has the fine nanocrystalline mixed structure with grain sizes of 10-20 nm. The fine grain size is presumably due to the high thermal stability of the remaining amorphous phase with enriched Nb concentrations.

Original languageEnglish
Pages (from-to)520-525
Number of pages6
JournalMaterials Science and Engineering A
Volume226-228
DOIs
Publication statusPublished - 1997 Jun 15
Externally publishedYes

Keywords

  • Amorphous phase
  • Crystallization
  • Hard magnetic properties
  • High remanence
  • Iron-praseodyium-boron alloy
  • Nanocrystalline mixed structure

ASJC Scopus subject areas

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

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