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

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4 Author(s)
Brown, D.N. ; Magnequench Technol. Center, Res. Triangle Park, NC, USA ; Smith, B. ; Ma, B.M. ; Campbell, P.

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 Hci from 770 to 930 kAm-1. Br 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 Hci values at some expense in Br. Gallium additions up to 0.5 at.% significantly increase both Br and Hci.

Published in:

Magnetics, IEEE Transactions on  (Volume:40 ,  Issue: 4 )

Date of Publication:

July 2004

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