Effect of Nb addition on the crystallization behavior and magnetic properties of melt-spun Fe-rich Fe-Nd-B ribbons

Toyohiko J. Konno, Minoru Uehara, Satoshi Hirosawa, Kenji Sumiyama, Kenji Suzuki

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

We compared the crystallization behavior and subsequent magnetic properties of α-Fe/Nd2Fe14B-based exchange-spring magnets with and without Nb addition, using differential thermal analysis, X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. In the optimally annealed Nd4Fe90Nb2B4 alloy, uniformly distributed α-Fe grains 50-80 nm in diameter are surrounded by Nd2Fe14B1 grains 10-20 nm in diameter as well as by amorphous intergranular layer regions enriched with Nb. The remanence, the coercivity, and the energy product are 1.35 T, 210 kA m-1 (2.65 kOe) and 103 kJ m3, respectively. In the annealed alloy without Nb, the α-Fe and Nd2Fe14B1 phases are brought about from two different intermediate states, resulting in a heterogeneous distribution.

Original languageEnglish
Pages (from-to)278-284
Number of pages7
JournalJournal of Alloys and Compounds
Volume268
Issue number1-2
DOIs
Publication statusPublished - 1998 Mar 27

Keywords

  • Crystallization in amorphous system
  • Hard-magnetic materials
  • Thermal analysis
  • Transmission electron microscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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