Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 20: Structurally and Chemically Complex Alloys (joint session MM/KFM)

KFM 20.2: Vortrag

Mittwoch, 20. März 2024, 17:30–17:45, C 230

Short range order in compositionally complex NiCoMnTi alloys — David Koch¹, Benedikt Beckmann¹, Oleh Ivasko², Martin von Zimmermann², Oliver Gutfleisch¹, and •Wolfgang Donner¹ — ¹Institute of Materials Science, Technical University of Darmstadt , 64287 Darmstadt, Germany — ²Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg, Germany

Analyzing the chemical order in compositionally complex alloys can be challenging and may become complicated by low elemental contrast. One such compositionally complex material is the all-d-Heusler alloy NiCoMnTi. These alloys exhibit a tunable magneto-structural phase transition, where the high-temperature phase has a long-range B2 structure that can be adjusted through proper thermal treatment. The typical long-range L2₁ structure found in classical p-metal Heusler alloys cannot be stabilized. In this report, we present data on short-range order in this system, which can be probed through diffuse X-ray scattering. To achieve this, we grew single crystals via abnormal grain growth and conducted synchrotron high-energy X-ray diffraction experiments to obtain high-quality diffuse scattering data. This data was then reconstructed into reciprocal space maps for interpretation.

Keywords: Diffuse Scattering; Short Range Order