Journal
MATERIALS TRANSACTIONS
Volume 61, Issue 3, Pages 438-443Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.MT-M2019265
Keywords
neodymium magnet; sintered magnet; coercivity; microstructure; scanning transmission electron microscopy; energy-dispersive X-ray spectrometry
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We have investigated the microstructure in a Nd-Fe-B sintered magnet subjected to the grain-boundary diffusion (GBD) process with Dy2O3. it was found that thin (Nd,Dy)(2)Fe14B shells with a thickness of at least 10 nm and an average Dy concentration of approximately 0.7 at% were formed even at the center of the specimen, at a depth of approximately 1 mm from the specimen surface. However, the area fraction of the fcc NdO phase remained almost constant at approximately 3% throughout the magnet irrespective of depth, and the grain-boundary wetting phase hardly changed except in the vicinity of the surface. Furthermore, the thickness (ca. 3 nm) and structure (amorphous) of the thin grain boundary phase existing between Nd2Fe14B grains remained almost unchanged by the Dy-GBD process, despite the formation of the core shell structure. Therefore, the Dy concentration in the thin Dy-substituted shell is important for improving the coercivity via the GBD process.
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