Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder

R. Gopalan, H. Sepehri-Amin, K. Suresh, T. Ohkubo, K. Hono, T. Nishiuchi, N. Nozawa, S. Hirosawa

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

An anisotropic full density Nd-Fe-B nanocrystalline magnet was produced by spark plasma sintering of hydrogenation-decomposition-desorption-recombination processed powder and subsequent in situ hot deformation. The in situ hot deformation caused the Nd2Fe14B grains elongated normal to the applied pressure with an enhanced c-axis texture. Accordingly, the remanence (Br) and maximum energy product were improved from 1.07 to 1.35 T and 192 to 224 kJ m-3, respectively, with a slightly reduced coercivity (Hc) of ∼1000 kA m-1.

Original languageEnglish
Pages (from-to)978-981
Number of pages4
JournalScripta Materialia
Volume61
Issue number10
DOIs
Publication statusPublished - 2009 Nov 1
Externally publishedYes

Keywords

  • Coercivity
  • HDDR Nd-Fe-B
  • Microstructure
  • Rare earth magnets
  • Spark plasma sintering

ASJC Scopus subject areas

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

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