Microstructural control of Nb addition in nanocrystalline hard magnets with different Nd content

Author

Wu, Y.Q. ; Kramer, M.J. ; Chen, Z. ; Ma, B.M. ; Ping, D.H. ; Hono, K.

Author_Institution

Ames Lab., Iowa State Univ., Ames, IA, USA

Volume

39

Issue

5

fYear

2003

Firstpage

2935

Lastpage

2937

Abstract

The effects of Nb addition on the hard magnetic properties and microstructure evolution in Nd₈Fe_78-xCo₈B₆Nb_x and Nd₁₂Fe_82-xB₆Nb_x nanocrystalline alloys are presented. Low Nd containing alloys consist of α-Fe and Nd₂Fe₁₄B phases. The Nd₁₂Fe_80.5B₆Nb_1.5 alloy probably contains NbFeB phase besides the α-Fe and Nd₂Fe₁₄B phases. It is found that Nb atoms tend to enrich at grain boundary regions, resulting in refined microstructure and significantly improved coercivity over a range of conventional Nd-Fe-B alloys.

Keywords

alloying additions; boron alloys; cobalt alloys; coercive force; crystal microstructure; ferromagnetic materials; grain boundaries; iron alloys; magnetic hysteresis; nanostructured materials; neodymium alloys; niobium alloys; permanent magnets; remanence; transmission electron microscopy; α-Fe phase; HREM; Nb addition; Nd₁₂Fe_82-xB₆Nb_x; Nd₁₂Fe_82-xB₆Nb_x nanocrystalline alloys; Nd₂Fe₁₄B phase; Nd₈Fe_78-xCo₈B₆Nb_x; Nd₈Fe_78-xCo₈B₆Nb_x nanocrystalline alloys; TEM; X-ray analyses; coercivity; energy product; grain boundary region; hard magnetic properties; hysteresis loops; microstructure evolution; permanent magnets; refined microstructure; remanence; Cobalt alloys; Coercive force; Iron alloys; Magnetic properties; Magnets; Microstructure; Neodymium; Niobium alloys; Remanence; Soft magnetic materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.815751

Filename

1233264