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MM: Fachverband Metall- und Materialphysik

MM 42: Topical Session: In Situ and Multimodal Microscopy in Materials Physics I (joint session MM/KFM)

MM 42.2: Talk

Wednesday, March 20, 2024, 16:00–16:15, C 130

TEM investigations of local structure and dynamics in PdNiP bulk metallic glass — •Olivia Vaerst¹, Martin Peterlechner², and Gerhard Wilde¹ — ¹Institute of Materials Physics, University of Münster, Münster, Germany — ²Karlsruhe Institute of Technology, Laboratory for Electron Microscopy (LEM), Karlsruhe, Germany

The bulk metallic glass PdNiP is kinetically highly stable against crystallisation and therefore often used as a model system for investigations of the glassy state. Such investigations include experiments to further explore the glass formation and the structure-property relations of metallic glasses. In this work, the focus lies on understanding the atomic structure and local mobility of PdNiP in various thermo-mechanical states. For this purpose, multimodal transmission electron microscopy (TEM) measurements are performed using advanced techniques. The main method used is electron correlation microscopy (ECM), where diffracted intensities of a time series of dark-field images are correlated to deduce structural dynamics parameters with nanometer spatial resolution. A systematic analysis of the effect of varying electron beam parameters on the dynamics is conducted and optimal measuring parameters for PdNiP are determined. 4D-STEM fluctuation electron microscopy (FEM) is used for complementary structural investigations concerning the medium-range order of the different thermo-mechanical material states. The results on local dynamics and structural properties are discussed with respect to properties measured by macroscopically averaging methods.

Keywords: TEM; Bulk Metallic Glass; structural dynamics; ECM; 4D-STEM