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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 alloys — David Koch¹, Benedikt Beckmann¹, Franziska Staab¹, Oleh Ivasko², Martin von Zimmermann², Karsten Durst¹, Oliver Gutfleisch¹, and •Wolfgang Donner¹ — ¹Institute 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