Coercivity enhancement of hydrogenation-disproportionation-desorption- recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys

H. Sepehri-Amin, T. Ohkubo, T. Nishiuchi, S. Hirosawa, K. Hono

Research output: Contribution to journalArticlepeer-review

162 Citations (Scopus)

Abstract

We report the coercivity enhancement of hydrogenation-disproportionation- desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m-1 (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results.

Original languageEnglish
Pages (from-to)1124-1127
Number of pages4
JournalScripta Materialia
Volume63
Issue number11
DOIs
Publication statusPublished - 2010 Nov

Keywords

  • Coercivity
  • Diffusion process
  • Nd-Fe-B
  • Permanent magnet

ASJC Scopus subject areas

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

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