Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Bulk Materials: Soft and Hard Permanent Magnets
MA 50.1: Vortrag
Donnerstag, 12. März 2026, 15:00–15:15, POT/0151
Ag-induced hardening and enhanced magnetic performance in SPS-consolidated CoCrFeMnNi high-entropy alloys — •Emmanouil Kasotakis1, Ivan Tarasov1, Tatiana Smoliarova1, Hamed Shokri2, Bilal Gökce2, Michael Farle1, and Natalia Shkodich1 — 1Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057 Germany — 2Chair of Materials Science and Additive Manufacturing, School of Mechanical Engineering and Safety Engineering, University of Wuppertal, Wuppertal, 42119 Germany
Nanocrystalline CoCrFeMnNi-Agx (x = 0; 1; 2.5; 5.5 at. %) high-entropy alloy (HEA) powders, produced via rapid two-step high-energy ball milling (HEBM) in Ar [1], were consolidated into ferromagnetic (Tc ~ 80 K) bulk samples by spark plasma sintering (SPS) at 700 K and 1000 K. Ag-free CoCrFeMnNi sintered at 1000 K formed a single-phase fcc alloy with uniform elemental distribution and a Vickers microhardness (HV0.2) of 2.4 GPa. Ag addition created distinct powder microstructures, from Ag-segregated regions (1 and 2.5 at. %) to uniform Ag distribution (5.5 at. %), increasing HV0.2 by 12% (to 2.7 GPa) in SPS-consolidated HEAs. In-field annealing (up to 700 K, 9 T) enhanced magnetization (M), coercivity (Hc), and remanence (Mr). CoCrFeMnNi-Agx (x = 5.5 at. %, 700 K) showed a tenfold rise in M (9 T, 310 K) to 40.2 Am2/kg, Hc = 46 kA/m, and Mr = 12.1 Am2/kg. We acknowledge DFG support (project ID: FA209/27-1).
[1] E. Kasotakis, et al. Acta Mater. 303, 121717 (2026).
Keywords: High entropy alloys; Magnetization; Coercivity; Magnetic annealing; Cantor