Enhancement of coercivity of hot-deformed Nd-Fe-B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy 20Cu20 eutectic alloy

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

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

The coercivity of a hot-deformed Nd-Fe-B magnet was enhanced from 1.6 to 2.6 T by a low-temperature grain boundary diffusion process using a Nd 60Dy20Cu20 near-eutectic alloy. The alloy melt infiltrates into the magnet through grain boundaries at the processing temperature of 650 C. The composition of ferromagnetic elements in the intergranular phase parallel to the c-planes decreases substantially and thin Dy-rich shell surrounds the Nd2Fe14B phase grains after the diffusion process, which explains the large enhancement in coercivity.

Original languageEnglish
Pages (from-to)647-650
Number of pages4
JournalScripta Materialia
Volume69
Issue number9
DOIs
Publication statusPublished - 2013 Nov 1
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

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

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