Regensburg 2025 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 16: Topical Session: Thermophysical Properties of Bulk Metallic Glasses and Bulk Metallic Glass-forming Liquids
MM 16.6: Talk
Wednesday, March 19, 2025, 12:15–12:30, H10
Tracing the Roots of Elastic Heterogeneity in Metallic Glass — •Reza Rashidi1, 2, Birte Riechers1, and Robert Maass1, 2, 3 — 1Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany — 2Department of Materials Engineering, Technical University of Munich, 85748 Garchingen, Germany — 3Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Metallic glasses (MGs) show structural and temporal heterogeneities over a broad range of time and length scales. With the aid of atomistic simulations, we can explain these dynamic and structural fluctuations at the nanometer scale. Here, our focus shifts to the larger length scale of property variations and the ongoing exploration of their origin. In past work, we suggested that cooling constraints during solidification could lead to elastic heterogeneities and therefor an elastic microstructure on the scale of ~100 nm (Materials & Design 229 (2023) 111929). In this presentation, we further support this idea by examining various casting geometries and thermal histories, tracking how elastic decorrelation lengths change with sample size and position within the MG. We also find that thermal annealing reduces decorrelation length-scale gradients and smooths out fluctuations in modulus values (Scripta Materialia 255 (2025)116380). In concert with the nano-elastic property assessment, we leverage spatially-resolved scanning nanobeam diffraction in the search for a structural origin of elastic microstructure.
Keywords: Metallic Glass; Heterogeneity; Elastic microstructure; Nanoindentation