期刊
ACTA MATERIALIA
卷 57, 期 5, 页码 1337-1346出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.11.019
关键词
Nd-Fe-B permanent magnets; Sintered magnets; Grain boundary; Atom probe
资金
- CREST-JST, Toyota Motor Co. Ltd
- Rare Metal Substitute Materials Development Project on development of technology for reducing dysprosium usage in a rare-earth magnet, METI
- World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan
To understand the mechanism of the increase in coercivity caused by post-sinter annealing of Nd-Fe-B-based magnets, we have investigated the microstructures of commercial sintered magnets by high-resolution scanning electron microscopy, transmission electron microscopy and atom probe tomography. Continuous thin layers of a Nd-rich amorphous phase were found along the grain boundaries in the post-sinter annealed sample, the chemical composition of which was determined to be Nd30Fe45Cu24.1N0.9. A fine Cu-enriched shell was also confirmed in the Nd-rich phase grain, suggesting the Nd2Fe14B grains are completely enveloped by the Cu- and Nd-enriched layers. Furthermore, a lamellar microstructure of the Cu-enriched phase was confirmed in some Nd-rich phase grains. The mechanism of the coercivity increase caused by post-sinter annealing is discussed based on these characterization results. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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