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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.
Date of Publication: July 2004