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MA: Fachverband Magnetismus
MA 51: Caloric Effects in Ferromagnetic Materials
MA 51.1: Hauptvortrag
Freitag, 22. März 2024, 09:30–10:00, H 2013
Functional and microstructural design of multicaloric Heusler alloys — •Franziska Scheibel1, Lukas Pfeuffer1, Andreas Taubel1, Christian Lauhoff2, Philipp Krooß2, Thomas Niendorf2, and Oliver Gutfleisch1 — 1TU Darmstadt, Darmstadt, Germany — 2University of Kassel, Kassel, Germany
Due to their first-order magnetostructural transition (FOMST), Ni-Mn-based Heusler alloys exhibit a variety of exploitable phenomena, such as magneto-, elasto-, and multicaloric effects. Functional performance and FOMST can be tailored by compositional and microstructural design. Besides a high cyclic caloric effect as a key requirement for solid-state refrigeration, shaping, functional fatigue, and scalability are key criteria when the material is to reach application. The mechanical strength and cyclic stability can be improved by grain refinement or precipitate formation through doping. By combining the two, it was even possible to achieve a cycle stability of more than 16000 cycles. [1]. Powder-based techniques (such as additive manufacturing (AM), spark plasma sintering, or hot compaction), can be used to achieve scalability and formability. We investigated the entire processing chain from gas-atomized, spherical powder to post-processed parts. In particular, this is important for AM to optimize microstructure, FOMST, and caloric effect [2,3]. We thank the ERC Adv. Grant "CoolInnov", and the CRC/TRR 270 "HoMMage" for funding.
[1] L. Pfeuffer et al., Acta Mater. 221, 117390 (2021)
[2] F. Scheibel et al., Adv. Eng. Mater., 2200069 (2022)
[3] F. Scheibel et al., MTLA 29, 101783 (2023)
Keywords: caloric effect; first-order magneto-structural transtion; microstructure design; additive manufacturing; Heusler alloy