Abstract
Anisotropic die-upset PrCo 5-based magnets were produced by hot pressing and subsequent die-upsetting of alloy powders activated by high-energy ball milling. In addition to the PrCo 5 major phase the magnets contained Pr 2Co 17, even when prepared from a stoichiometric 1:5 alloy. Hard magnetic properties can be improved by partial Sm substitution for Pr and partial Cu substitution for Co. A higher cobalt/rare-earth ratio as well as the addition of Fe was found to be unfavorable for the deformation-induced anisotropy. The largest values of remanence, intrinsic coercivity and maximum energy product in hot-pressed magnets were obtained for Pr 0.7Sm 0.3Co 5.5 (7.8 kG, 14.1 kOe and of 13.1 MGOe) and in die-upset magnets for Pr 0.9Sm 0.1(Co 0.98Cu 0.02) 5 (9.2 kG, 10.5 kOe and 16.7 MGOe).
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