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MA: Fachverband Magnetismus

MA 17: Micro- and Nanostructured Magnetic Materials

MA 17.3: Vortrag

Dienstag, 18. März 2025, 14:30–14:45, H18

Effect of Ag addition on structure, morphology and magnetism of CoCrFeMnNi micro powders prepared by HEBM — •Emmanouil Kasotakis, Ivan Tarasov, Tatiana Smoliarova, Michael Farle, and Natalia Shkodich — Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057 Germany

We fabricated (CoCrFeMnNi)-Agx (x=0; 2; 5; 10 wt.%) high entropy alloy nanocrystalline (~10 nm) microparticles which are paramagnetic at room temperature (Tc = 80 K) by a two-step high energy ball milling (HEBM) [1] process in Argon at 700/1400 rpm. An elemental powder blend of Co, Cr, Fe, Mn, Ni was milled for 60 min to produce single phase FCC Cantor alloy with a homogeneous distribution of the principal elements, followed by 10 min of HEBM with the addition of Ag. By varying the Ag concentration, we modified the morphology. For 2 and 5 wt.% Ag (Cantor + Ag) we find flake-like core shell particles, and for 10 wt.% Ag, we obtain round homogeneous particles, with a lattice expansion of the FCC phase. Annealing cycles up to 700 K in a magnetic field of 1 T magnetic field increased M at 9 T up to 2.5-fold (14 Am^2/kg) for homogeneous particles (x = 10 wt.%) and Hc up to 5-fold (41 kA/m) for core shell particles (x = 2 wt.%) at 310 K. We acknowledge DFG financial support (project ID: FA209/27-1).

[1] N.F. Shkodich, M. Spasova, M. Farle, et al. J. Alloys Compd. 816, 152611 (2020).

Keywords: High entropy alloys; High energy ball milling; Solid solution; Magnetization