Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Bulk Materials: Soft and Hard Permanent Magnets

MA 30.5: Vortrag

Mittwoch, 19. März 2025, 17:15–17:30, H18

Pr-Fe-B hot deformed magnets for low-temperature applications — •Priyatosh Sahoo¹, Alex Aubert¹, Fernando Maccari¹, Yuye Wu², Konstantin Skokov¹, and Oliver Gutfleisch¹ — ¹Technische Universität Darmstadt, Germany — ²Beihang University, China

Nd-Fe-B based PMs are the most prevalent in various applications due to their high coercivity and remanence, which result in exceptional energy product values near room temperature. However, their performance significantly diminishes below 135 K due to Spin Reorientation Transition (SRT). In contrast, when Nd is substituted by Pr, these magnets do not exhibit such transitions at low temperatures, making them preferable for cryogenic applications such as space industry. In our study, we compared the low-temperature performance of Pr17Fe76.5Cu1.5B5 and Nd17Fe76.5Cu1.5B5 hot deformed (HD) magnet. The microstructure of HD magnets consists of grains in the range of the critical single domain particle size of these systems, i.e., 200-300 nm, which enhances coercivity without the necessity of adding heavy rare earth elements. We conducted a comprehensive analysis that examined intrinsic magnetic properties based on single crystal studies and the transition to extrinsic properties through microstructure engineering along the hot deformation process. Additionally, we explored the effect of doping Pr-Fe-B with Cu in the hot deformation process and correlated its influence on the magnetic properties and microstructure. We acknowledge Deutsche Forschungsgemeinschaft's (DFG) funding within the CRC/TRR 270 (Project-ID 405553726).

Keywords: Pr-Fe-B Magnets; Hot Deformed Magnets; Microstructure Engineering; Cryogenic Applications; Intrinsic Properties