SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 42: Caloric Effects in Ferromagnetic Materials
MA 42.9: Vortrag
Donnerstag, 30. März 2023, 17:15–17:30, HSZ 04
Rapid bulk sintering and magnetocaloric performance of polycrystalline Fe2Al1.15-xB2GexGax (x=0, 0.05) MAB phases — •Benedikt Beckmann1, Tarek El-Melegy2, David Koch1, Ulf Wiedwald3, Michael Farle3, Fernando Maccari1, Joshua Snyder2, Konstantin Skokov1, Michel Barsoum2, and Oliver Gutfleisch1 — 1TU Darmstadt, Institute of Materials Science, Darmstadt, Germany — 2Drexel University, Department of Materials Science & Engineering, Philadelphia, PA, USA — 3University of Duisburg Essen, CENIDE, Duisburg, Germany
Reactive single-step hot-pressing at 1473 K and 36 MPa for 4 h produces dense, bulk, near single-phase, low-cost and low-criticality Fe2Al1.15B2 and Fe2Al1.1B2Ge0.05Ga0.05 MAB samples, showing a second-order magnetic phase transition with favorable magnetocaloric properties at room temperature. The maximum isothermal entropy change Δ sT of hot-pressed Fe2Al1.15B2 in magnetic field changes of 2 and 5 T amounts to 2.5 and 5 J(kgK)-1 at 287.5 K and increases by Ge and Ga addition to 3.1 and 6.2 J(kgK)-1 at 306.5 K, respectively. The directly measured maximum adiabatic temperature change Δ Tad in magnetic field changes of 1.93 T is improved by the alloy design from 0.9 to 1.1 K. Our criticality assessment shows that hot-pressed Fe-based MAB phases provide a promising compromise between material and processing cost, criticality and magnetocaloric performance around room temperature.
We acknowledge financial support from DFG (CRC/TRR 270, Project-ID 405553726).