Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.22: Poster
Donnerstag, 12. März 2026, 15:00–17:00, P4
Enhancing Mechanical Stability of Heusler Alloys via the Powder-in-Tube Method — •T. Niehoff1,2, L Beyer3,4, J. Puy5, J. Freudenberger3,4, O. Gutfleisch5, J. Wosnitza1,2, F. Scheibel5, and T. Gottschall1 — 1Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Dresden, Germany — 3Leibniz-Institut für Festkörper- und Werkstoffforschung IFW, Dresden, Germany — 4TU Bergakademie Freiberg, Freiberg, Germany — 5Institute of Materials Science, Technical University of Darmstadt Darmstadt, Germany
We address the long-standing problem of mechanical fatigue in Heusler-based elastocaloric and multicaloric materials by applying the Powder-in-Tube (PIT) method to stabilize the material inside a steel shell. This significantly enhances mechanical robustness. Under cyclic loading up to 100,000 cycles and high-load tests, PIT samples retain their structural integrity, showing only minor, non-critical end cracks while the core remains thermally connected to the shell. Even after plastic deformation, the Heusler core stays intact. Magnetization before and after cycling exhibits only minimal changes, confirming durability, and magnetocaloric measurements demonstrate excellent thermal coupling between core and metal shell. Overall, the PIT method extends the operational lifetime of Heusler alloys by orders of magnitude and allows independent optimization of mechanical stability and caloric performance.
Keywords: Magnetocaloric; Elastocaloric; Multicaloric; Heusler alloys