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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 CoCrFeNiGa_x (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 CoCrFeNiGa_x (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 CoCrFeNiGa_0.5 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