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MM: Fachverband Metall- und Materialphysik

MM 57: Phase Transformations III

MM 57.1: Talk

Thursday, March 21, 2024, 11:45–12:00, C 230

Elastic precursors of the martensitic phase transition in compositionally complex NiCoMnTi alloysDavid Koch1, Benedikt Beckmann1, Franziska Staab1, Oleh Ivasko2, Martin von Zimmermann2, Karsten Durst1, Oliver Gutfleisch1, and •Wolfgang Donner11Institute of Materials Science, Technical University of Darmstadt , 64287 Darmstadt, Germany — 2Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg, Germany

Elastic precursors, such as elastic constants and phonon softening, leading to the martensitic phase transition, are of fundamental interest in understanding the mechanism behind a martensitic phase transition. This phenomenon has been extensively studied, for instance, in p-metal-containing Heusler alloys, where phonon softening along the [110] direction is commonly observed. The compositionally complex all-d-Heusler alloy NiCoMnTi exhibits a martensitic phase transition similar to p-metal Heusler alloys, even in the absence of a p-d hybridization. By studying temperature-dependent thermal diffuse x-ray scattering in single crystals, we have investigated these elastic precursors. The results shed light on the mechanism of the martensitic phase transition in all-d-Heusler alloys.

Keywords: Martensitic Phase Transition; Heusler; Diffuse Scattering

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