Regensburg 2025 – wissenschaftliches Programm
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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 16.8: Vortrag
Mittwoch, 19. März 2025, 12:45–13:00, H10
Unveiling the Asymmetry in Density within the Shear Bands of Metallic Glasses — •Harald Rösner1, Arabinda Bera2, and Alessio Zaccone2 — 1Universität Münster, Institut für Materialphysik, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2University of Milan, Department of Physics "A. Pontremoli'', via Celoria 16, 20133 Milan, Italy
Plastic deformation in metallic glasses at room temperature leads to the development of shear bands due to shear localization. In many experiments, shear bands have shown local density variations along their path, with a distinct imbalance in magnitude between local densification and dilation. However, a comprehensive mechanistic understanding or theory to explain this asymmetry has been lacking until now. Here, we introduce a new model [1] that consists of a sequential arrangement of alternating topological charges, generating a dipolar field. The resulting microscopic displacement field, when integrated into the deformation gradient tensor, provides an accurate analytical solution for the observed imbalances in the density variations. The implications of this model are discussed, highlighting the potential to elucidate a broader range of observations in shear bands.
[1] H. Rösner, A. Bera, and A. Zaccone, Phys. Rev. B, 110(1), 014107 (2024).
Keywords: bulk metallic glasses; plastic deformation; shear bands