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MM: Fachverband Metall- und Materialphysik
MM 26: Topical Session: Thermophysical Properties of Bulk Metallic Glasses and Bulk Metallic Glass-forming Liquids
MM 26.3: Vortrag
Donnerstag, 20. März 2025, 10:45–11:00, H10
Probing Medium-Range Order in Metallic Glasses with 4D-STEM — •Birte Riechers1 and Robert Maaß1,2,3 — 1Federal Institute of Materials Research and Testing (BAM), Germany — 2University of Illinois at Urbana-Champaign, USA — 3Technical University of Munich, Germany
Medium-range order (MRO) in metallic glasses (MGs) plays a crucial role for their applicability, as it significantly affects their mechanical properties. Important details of the MRO were revealed by micro-second long atomistic simulations, that have shed light on the temperature- and time-dependent evolution of MRO, especially in connection to the emergence of a network of specific structural motifs (JALCOM 821, 153209, 2020; Acta Mater. 267, 119730, 2024).
While these insights help to understand the effect of MRO evolution, the experimental validation remains challenging. To test these findings, we employ 4-dimensional scanning transmission electron microscopy (4D-STEM) (Ultramicroscopy 232, 113405, 2022) to analyze both the first and second diffraction shells of MGs. By examining the diffraction symmetries at these length scales, we aim to uncover the dominant structural features associated with MRO.
Keywords: Metallic Glass; Medium-range order; 4D-STEM; Structure-property relationship