Effect of Nd content on the microstructure and coercivity of hot-deformed Nd-Fe-B permanent magnets

J. Liu, H. Sepehri-Amin, T. Ohkubo, K. Hioki, A. Hattori, T. Schrefl, K. Hono

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

The microstructure of hot-deformed Nd-Fe-B permanent magnets with different Nd contents was investigated in order to correlate them with the hard magnetic properties. A thick distinct Nd-rich grain boundary (GB) layer was observed in a high Nd content sample by scanning electron microscopy and transmission electron microscopy. Three-dimensional atom probe results showed a significant increase in the Nd content in the GB as the overall Nd content in the alloy increased. We found a clear correlation between the Nd concentration in the GB layer and the coercivity. The mechanism of the coercivity increase is discussed based on the microstructure characterization and micromagnetic simulation results.

Original languageEnglish
Pages (from-to)5387-5399
Number of pages13
JournalActa Materialia
Volume61
Issue number14
DOIs
Publication statusPublished - 2013 Aug
Externally publishedYes

Keywords

  • Chemical composition
  • Coercivity
  • Hot-deformed
  • Microstructure
  • Nd-Fe-B

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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