J-STAGE トップ  >  資料トップ  > 書誌事項

日本金属学会誌
Vol. 81 (2017) No. 1 p. 2-10

記事言語:

http://doi.org/10.2320/jinstmet.JA201606

特集「ネオジム磁石の金属組織および粒界近傍の磁性と保磁力機構」

This paper presents our recent microstructure characterization work of Nd-Fe-B sintered magnets with the emphasis of the structure and chemistry of Nd-rich phases at grain boundary triple junctions and thin Nd-rich phases formed along grain boundaries. The use of secondary electron imaging through the in-lens type detector combined with the TEM analysis lead to the unambiguous identification of Nd-rich phases at grain boundary triple junctions. Through microstructure characterization of commercial sintered magnet by the correlative characterization and atomic scale high angle annular dark field scanning TEM (HAADF-STEM)combined with energy dispersive spectroscopy (EDS), we have concluded the formation of non-ferromagnetic grain boundary phase along the grain boundaries parallel to the easy axis is one of the keys to increase the coercivity. The trace addition of Ga into Nd-rich Nd-Fe-B magnet demonstrated the substantial coercivity increase by the formation of non-ferromagnetic Nd-rich grain boundary phase.

Copyright © 2016 (公社)日本金属学会

記事ツール

この記事を共有