Development of High-Performance Pr-Co Magnets for High-Temperature Applications

Technical Objectives 1 Establish the phase equilibria in PrxCo100-x-yIny alloys with 16 or x or 20, 0 or y or 1.5 for the temperature range of 500 to 1100 deg C. The knowledge obtained will be used to fabricate, via a simple inexpensive process, In-added PrCo5 sintered magnets with properties superior to the existing 217 Sm-Co magnets in the temperature range of 25 to 200 deg C. 2 Establish the mechanisms of texture development in nanocrystalline PrCo5 magnets subjected to hot plastic deformation. This knowledge will allow us to improve the texture of the magnets, which ultimately will lead to the fabrication of nanocrystalline PrCo5 magnets with properties superior to the existing 217 Sm-Co magnets, in both the maximum energy product and coercivity. 3 Establish the composition and temperature boundaries of the PrCo5delta structure in the PrxM2Co100-x-z alloys with 11 or x or 16, 0 or z or 2, M Hf, Cu, GaC obtained via equilibrium and non-equilibrium processes. This knowledge will allow the fabrication of novel hightemperature magnets based on the off-stoichiometric PrCo5delta structure with significantly improved properties for high-temperature applications.