SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Materials for Efficient Energy Conversion
MA 3.9: Vortrag
Montag, 27. März 2023, 11:45–12:00, HSZ 401
Tailoring thermal hysteresis and microstructure of Ni-Mn-based Heusler alloys for multicaloric cooling applications — •Andreas Taubel1, Franziska Scheibel1, Lukas Pfeuffer1, Benedikt Beckmann1, Navid Shayanfar1, Tino Gottschall2, Konstantin Skokov1, and Oliver Gutfleisch1 — 1TUDarmstadt, Material Science, 64287 Darmstadt — 2Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, 01328 Dresden
Refrigeration based on the magnetocaloric effect (MCE) attracts a lot of attention since it can be more energy efficient and environmentally friendly than current vapor compression technology. The concept uses a solid-state magnetic material that heats up and cools down cyclically when exposed to a changing magnetic field. The problem of thermal hysteresis for efficient materials with a first-order phase transition can be overcome by applying stress as a second stimulus [1].
In this work, we develop Ni-Co-Mn-In and Ni-Co-Mn-Ti Heusler alloys towards using them in a novel multi-stimuli cooling concept. We investigated the influence of different microstructures from chemical variation and different processing routes on the magnetocaloric and elastocaloric performance of these materials [2,3]. The introduction of secondary phases significantly enhances the mechanical stability.
We acknowledge funding by ERC (Adv. Grant Cool Innov, GrantNo. 743116) and by DFG (CRC HoMMage, ID 405553726 *TRR 270)
[1] T. Gottschall et al., Nature Mat. 17, 929*934 (2018)
[2] L. Pfeuffer et al., Acta Materialia 217 1175157 (2021)
[3] A. Taubel et al., Acta Mater. 201, 425-434 (2020)