Optimisation of the processing of Nd-Fe-B with dysprosium addition

G Yan, PJ McGuiness, John Farr, Ivor Harris

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Magnets based on Nd16Fe76B8 with DyH3 additions have been sintered at different temperatures. The magnetic properties, microstructure and compositions have been examined. Details of progress of Dy entering the hard matrix phase (phi) is observed and an evolution mode of the relevant sintering process is proposed, observed and reported in the present work. Hydrogen absorption and desorption of the magnets were examined by HDTA. The optimum sintering temperature for these magnets has been established. Microstructural and EDX examinations revealed that a relatively Dy-rich phase formed in the Nd-rich grain boundary phase and this slowed down the substitution of Nd by Dy in the Nd2Fe14B matrix phase, possibly enhancing local coercivity without excessive attenuation of the remanence. Hydrogen Decrepitation (HD) occurred as sintered RE-Fe-B magnets were exposed to hydrogen at room temperatures. (C) 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)L20-L24
JournalJournal of Alloys and Compounds
Volume491
Issue number1-2
DOIs
Publication statusPublished - 1 Feb 2010

Keywords

  • Sintering
  • Dysprosium hydride
  • Magnets
  • Remanence
  • Dysprosium
  • Rare earth
  • Microstructure
  • Coercivity

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