Grain size dependence of coercivity of hot-deformed Nd-Fe-B anisotropic magnets

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

Research output: Contribution to journalArticlepeer-review

180 Citations (Scopus)

Abstract

The dependence of the coercivity of hot-deformed anisotropic Nd-Fe-B magnets on grain size has been studied by processing the magnets at different temperatures. Higher coercivity was obtained in fine-grained magnets processed at lower temperature (700 °C), in which intergranular phases formed uniformly along the grain boundaries. On the other hand, large Nd-rich triple-junction phases were frequently observed in the larger grain-sized magnets processed at higher temperature (900 °C). Three-dimensional atom probe analyses showed that the Nd content in the intergranular phase decreased as the processing temperature increased. The origin of the coercivity difference in these hot-deformed magnets processed at different temperatures is discussed based on micromagnetic analysis of the observed microstructures complemented with finite-element micromagnetic simulations.

Original languageEnglish
Pages (from-to)336-343
Number of pages8
JournalActa Materialia
Volume82
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Coercivity
  • Micromagnetic simulations
  • Microstructure
  • Nd-Fe-B
  • Permanent magnet

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