High-coercivity hot-deformed Nd-Fe-B permanent magnets processed by Nd-Cu eutectic diffusion under expansion constraint

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

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)

Abstract

The application of expansion constraint during the grain-boundary diffusion process using Nd70Cu30 eutectic alloy minimizes the remanence loss for the coercivity enhancement by optimizing the volume fraction of the Nd(Cu)-rich non-ferromagnetic intergranular layer. The diffusion-processed sample exhibits μ0Hc ∼ 2 T, μ0Mr = 1.36 T and (BH)max = 358 kJ m -3 at room temperature. Because of the low-temperature coefficient of coercivity, the magnet showed (BH)max ∼ 191 kJ m-3 at 200 °C, which is superior to that of Dy-containing high-coercivity sintered magnets.

Original languageEnglish
Pages (from-to)48-51
Number of pages4
JournalScripta Materialia
Volume81
DOIs
Publication statusPublished - 2014 Jun 15
Externally publishedYes

Keywords

  • Coercivity
  • Diffusion process
  • Hot-deformed magnet
  • 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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