Coercivity enhancement of selective laser sintered NdFeB magnets by grain boundary infiltration

Christian Huber, Hossein Sepehri-Amin, Michael Goertler, Martin Groenefeld, Iulian Teliban, Kazuhiro Hono, Dieter Suess

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Laser powder bed fusion is a well-established additive manufacturing method that can be used for the production of net-shaped Nd–Fe–B magnets. However, low coercivity has been one of the drawbacks in the laser powder bed fusion processed Nd–Fe–B magnets. In this work, we have demonstrated that the grain boundary diffusion process using low-melting Nd–Cu, Nd–Al–Ni–Cu, and Nd–Tb–Cu alloys to the selective laser sintered NdFeB magnets can results in a substantial enhancement of coercivity from 0.65 T to 1.5 T. Detailed microstructure investigations clarified that the formation of Nd-rich grain boundary phase, the introduction of Tb-rich shell at the surface of Nd2Fe14B grains, and maintaining the grain size in nano-scale are responsible for the large coercivity enhancement.

Original languageEnglish
Pages (from-to)66-71
Number of pages6
JournalActa Materialia
Volume172
DOIs
Publication statusPublished - 2019 Jun 15
Externally publishedYes

Keywords

  • Coercivity
  • Grain boundary
  • NdFeB
  • Selective laser sintering
  • additive manufacturing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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