Coercivity enhancement of rapidly solidified Nd-Fe-B magnet powders

H. Sepehri-Amin, D. Prabhu, M. Hayashi, T. Ohkubo, K. Hioki, A. Hattori, K. Hono

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


A high coercivity of 2.6 T is achieved in melt-spun Nd-Fe-B isotropic magnet powders by the grain boundary diffusion process using Nd 80Cu20 and Nd82Al18 alloys. δM measurements indicate that Nd2Fe14B nanocrystals are magnetically decoupled after the diffusion process. Transmission electron microscopy revealed that the exchange decoupling is due to the formation of a thin Nd-rich phase at the grain boundaries. The mechanism of the coercivity enhancement is discussed based on microstructure observations and micromagnetic simulations.

Original languageEnglish
Pages (from-to)167-170
Number of pages4
JournalScripta Materialia
Issue number3-4
Publication statusPublished - 2013 Feb
Externally publishedYes


  • Coercivity
  • Diffusion process
  • Exchange coupling
  • Grain boundary
  • Nd-Fe-B

ASJC Scopus subject areas

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


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