SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Materials for Efficient Energy Conversion
MA 3.7: Vortrag
Montag, 27. März 2023, 11:15–11:30, HSZ 401
Tailoring of thermal hysteresis in Ni-Mn-Sn shape memory alloys via microstructure design — •Franziska Scheibel1, Chistian Lauhoff2, Johannes Puy1, David Koch1, Philipp Krooß2, Thomas Niendorf2, and Oliver Gutfleisch1 — 1Technische Universität Darmstadt, Darmstadt, Germany — 2Universität Kassel, Kassel, Germany
Ferromagnetic shape memory alloys (FSMA) like Ni-Mn-Sn undergo a magneto-structural transition and show giant multicaloric properties. Thus, these materials are excellent for caloric refrigeration as an energy efficient, environmentally friendly and safe alternative for vapor compression cooling. However, tailoring of the inherent thermal hysteresis is essential for material development [1].
The hysteresis can be influenced by the microstructure (grain configuration and size, texture, defects, or internal stress) [2]. In this study, the grain size and arrangement have been modified by powder-based processing using spark-plasma sintering and additive manufacturing technique to tailor both the microstructure and the thermal hysteresis at the same time. The understanding of the relation between grain-size, texture, grain arrangement and multiple external stimuli is essential to develop materials with first-order magneto-structural transition transformation for multicaloric cooling.
This work was supported by the ERC Advanced Grant "Cool Innov" and the SFB-TRR270 "HoMMage".
[1] F. Scheibel et al., Energy Technol. 6, 1397 (2018)
[2] O. Gutfleisch et al., Phil. Trans. R. Soc. A 374: 20150308 (2016)