Regensburg 2025 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Functional Materials: Performance, Reliability and Degradation; and Complex Materials (joint session MM/KFM)

KFM 17.5: Talk

Thursday, March 20, 2025, 12:45–13:00, H23

Chemical short-range order and local lattice distortions in High-Entropy Alloys: state of the art — •Andrea Fantin, Anna Maria Manzoni, Reza Darvishi Kamachali, and Robert Maass — Bundesanstalt fuer Materialforschung und -pruefung, Unter den Eichen 87, 12205 Berlin, Germany

Understanding the intricate atomic-scale structures within High-Entropy Alloys (HEAs) is crucial for tailoring their properties for diverse applications. This contribution tries to provide a brief overview of the state-of-the-art experimental techniques employed to probe local lattice distortions and chemical short-range order in HEAs, with specific focus on X-ray absorption spectroscopy and total scattering. The main problem to overcome in multi-component alloys is the intrinsic reduced scattering contrast between nearest neighbors in the periodic table, which limits the amount of information that can be extracted from the data. This statement remains valid when employing transmission electron microscopy, as well. Specific examples such as the Al-Co-Cr-Cu-Fe-Ni fcc system [Small Science 4(2), 2300225 (2024); Nature Communications 15(1), 7815 (2024)] and the MoNbTaW bcc system [Materials Research Letters 12(5), 346-354 (2024)] will be outlined. It comes clear that rather than specific techniques, it is only the combination of several experiments, supported by simulations and multi-technique simultaneous structural refinements, that can help in disentangling the different contributions to performances of each element within the alloy solid solution, with strength and weaknesses depending on the specific experimental measurements.

Keywords: High-Entropy Alloys; Chemical short-range ordering; Local lattice distortions; X-ray absorption spectroscopy; Total Scattering