SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 28: Liquid and Amorphous Metals
MM 28.5: Vortrag
Mittwoch, 29. März 2023, 11:15–11:30, SCH A 118
Enhancing mechanical properties by introducing surface grooves in metallic glasses — •Xudong Yuan1, Daniel Şopu1,2, Kaikai Song3, and Jürgen Eckert1,4 — 1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, Leoben A-8700, Austria — 2Institut für Materialwissenschaft, Fachgebiet Materialmodellierung, Technische Universität Darmstadt, Otto-Berndt-Str.3, Darmstadt D-64287, Germany — 3School of Mechanical, Electrical and Information Engineering, Shandong University (Weihai), Weihai 264209, China — 4Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, Leoben A-8700, Austria
The correlation between the mechanical properties and surface defects in metallic glasses (MGs) is investigated by surface ultrasonic bonding experiments and molecular dynamics simulations. The strength together with the compression ductility of Zr65Cu15Ni10Al10 MG can be enhanced by introducing surface grooves. Induced grooves and pre-shear bands (SBs) lead to the formation and interaction of multiple SBs during compression, which consequently enhances ductility. Additionally, the thermal-induced nanocrystallization, together with generated free volume and residual stresses around the grooves contribute to the emergence of hierarchical structure and stress heterogeneity, which delays the propagation of dominant SB and enables the improvement of strength and plasticity of MG.