Effect of WS2/Al co-doping on microstructural and magnetic properties of Nd−Fe−B sintered magnets

Kyoung Hoon Bae, Seong Rae Lee, Hyo Jun Kim, Min Woo Lee, Tae Suk Jang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effect of WS2 (0–1.2 wt.%) and Al (0.3 wt.%) doping on microstructural and magnetic properties of Nd2Fe14B sintered magnets was investigated. Grain growth in WS2-doped magnets was inhibited by the grain boundary (GB) pinning resulting in increased magnet coercivity. Al co-doping (0.3 wt.%) produced continuous Nd-rich grain boundary phases (GBPs), in which fine WFeB precipitates were distributed selectively at the grain boundaries due to the higher fluidity of the liquid phases. 0.6 wt.% WS2/Al co-doped magnets are characterized by the optimum magnetic properties because of the smaller grain sizes and formation of continuous Nd-rich GB phases. When the WS2 content exceeds 0.6 wt.%, magnetic properties of the resulting magnets deteriorate due to the reduction in magnet density and relatively large WFeB precipitates formed inside the main phase and at the GBs.

Original languageEnglish
Pages (from-to)321-326
Number of pages6
JournalJournal of Alloys and Compounds
Volume673
DOIs
Publication statusPublished - 2016 Jul 15

Keywords

  • Magnetic measurements
  • Magnetization
  • Microstructure
  • Powder metallurgy
  • Rare earth alloys and compounds

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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