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Pr-Fe-B die-upset magnets exhibited a lower remanence and a higher coercivity than analogous Nd-Fe-B magnets, with the microstructure of both magnets exhibiting similarities. Enhanced magnetic domain wall pinning and increased coercivity in Pr-Fe-B magnets was due to the thick intergranular phase. Hot-worked Pr2Fe14B magnets were obtained from melt-spun ribbons.

Differential scanning calorimetric estimations of the Curie temperatures of cobalt and iron diffusion in die-upset Nd-Fe-Co-B-magnets from metal-spun ribbons reveal a marked diffusion between ribbons that cause microstructure alteration and the deformation of the rigid 2-14-1 magnet. Cobalt diffuses across ribbons during hot working to rearrange the transition metal accumulation over the magnet. Homogenization of the metal composition is, however, not thorough.