Comparison of coercivity and squareness in hot-deformed and sintered magnets produced from a Nd-Fe-B-Cu-Ga alloy

X. D. Xu, H. Sepehri-Amin, T. T. Sasaki, M. Soderžnik, X. Tang, T. Ohkubo, K. Hono

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We have fabricated a hot-deformed magnet from the Fe77.1Nd11.6Pr3.7B5.1Cu0.1Co1.0Al0.9Ga0.5 alloy composition that was developed for exchange-decoupled sintered magnet. The hot-deformed magnet showed a higher coercivity, μ0Hc = 1.93 T, and better squareness, Hk90/Hc = 0.96, compared to those of the sintered magnet, μ0Hc = 1.48 T and Hk90/Hc = 0.65. Microstructural analyses revealed the higher coercivity in the hot-deformed magnet originates from a larger contribution from the anisotropy term in the Kronmüller formula owing to fine grains, while the better squareness is primarily due to the exchange coupling of the Nd2Fe14B grains through ferromagnetic grain boundary phase, as suggested by atom probe tomography and magneto-optical Kerr effect microscopy.

Original languageEnglish
Pages (from-to)9-14
Number of pages6
JournalScripta Materialia
Volume160
DOIs
Publication statusPublished - 2019 Feb
Externally publishedYes

Keywords

  • Coercivity
  • Grain boundary phase
  • Hot-deformed magnet
  • Nd-Fe-B
  • Squareness

ASJC Scopus subject areas

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

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