Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 16: Crystal Structure Defects / Real Structure / Microstructure I
KFM 16.3: Vortrag
Mittwoch, 20. März 2024, 15:40–16:00, E 124
Influence of Ga concentration on crystal structure of CoCrFeNiGax (x = 0.5, 1) high-entropy alloys — •Tatiana Smoliarova1, Ivan Tarasov1, Marina Spasova1, András Kovács2, Rafal E. Dunin-Borkowski2, Michael Farle1, and Natalia Shkodich1 — 1Faculty of Physics and Center for Nanointegration, Universität Duisburg-Essen, Duisburg, Germany — 2Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Germany
High-entropy alloys (HEAs) offer a novel approach to explore multicomponent phase diagrams, leading to the discovery of new materials. Here, we report a transmission electron microscopy (TEM) study of the structural changes observed in microsized CoCrFeNiGax (x = 0.5, 1.0) powders, prepared by high-energy ball milling (HEBM) in planetary ball mills at room temperature. The process results in the formation of an FCC crystal structure and compositional homogeneity. Additionally, we find in bulk samples obtained by consolidating the prepared micropowder using the spark plasma sintering (SPS) process (1073 K) preferential fcc structure for the CoCrFeNiGa0.5 powder, and a partial transformation of the FCC into a BCC structure for the equiatomic CoCrFeNiGa powder. Financial support by DFG, CRC/TRR 270 (project ID 405553726) is acknowledged.
Keywords: high-entropy alloys; transmission electron microscopy