The dependence of magnetic properties and hot workability of rare earth-iron-boride magnets upon composition

Author

Brown, D.N. ; Smith, B. ; Ma, B.M. ; Campbell, P.

Author_Institution

Magnequench Technol. Center, Res. Triangle Park, NC, USA

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2895

Lastpage

2897

Abstract

Hot deformed magnets can be commercially produced from hyper-stoichiometric nanocrystalline Nd-Fe-B compositions. This paper summarizes the influence of the rare-earth component (Nd, Pr, Dy) and gallium to magnetic properties and hot workability of die-upset magnets based upon hyper-stoichiometric compositions. Increasing the Nd from 13.3 to 14.4 at.% raises the H_ci from 770 to 930 kAm^-1. B_r values are highest (1.31 T) at lower levels of RE (∼13 at.%), although such compositions exhibit a decrease in hot workability. The substitution of Dy and Pr for Nd promotes higher H_ci values at some expense in B_r. Gallium additions up to 0.5 at.% significantly increase both B_r and H_ci.

Keywords

ferromagnetic materials; melt spinning; nanostructured materials; permanent magnets; rare earth alloys; NdFeB; die-upset magnets; hot deformed magnets; hot workability; hyper-stoichiometric nanocrystalline compositions; iron-boride magnets; magnetic properties; melt-spun; rare Earth magnets; Chemical analysis; Gallium; Iron; Magnetic materials; Magnetic properties; Magnets; Neodymium; Plasma measurements; Powders; Workability; Dy; Ga additions; Hot deformed magnets; Pr; melt-spun NdFeB;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832240

Filename

1325677