Abstract
Recent state-of-the-art microstructure investigations on Nd-Fe-B sintered magnets have revealed that the Nd2Fe14B grains in conventional sintered magnets are exchange-coupled through ferromagnetic grain boundary phase and the coercivity is governed by domain wall pinning, while exchange-decoupled sintered magnets can be processed by tuning the chemical composition to a slightly Nd-rich and B-lean one with Ga-doping. The coercivity of exchange-decoupled magnets is governed by the nucleation mechanism, giving rise to higher coercivity. Based on recent studies on microstructure-coercivity relationships of various Nd-Fe-B magnets, prospect of HRE-free high coercivity and high remanence magnets is discussed.
Original language | English |
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Pages (from-to) | 6-13 |
Number of pages | 8 |
Journal | Scripta Materialia |
Volume | 151 |
DOIs | |
Publication status | Published - 2018 Jul 1 |
Externally published | Yes |
Keywords
- Coercivity
- Heavy rare earth
- Nd-Fe-B
- Permanent magnet
- Rare earth permanent magnet
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys