Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Liquid and Amorphous Metals III: Deformation of Metallic Glasses

MM 20.1: Vortrag

Dienstag, 17. März 2015, 10:15–10:30, H 0107

Potential energy landscape of deformed Cu-Zr based metallic glasses — •Tobias Brink and Karsten Albe — Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, Technische Universität Darmstadt, Germany

Metallic glasses are usually described in terms of a potential energy landscape which consists of large megabasins that contain small local minima with low barriers between them. In this work, we explore the potential energy landscape of Cu-Zr glasses of varying composition using an adaptive kinetic Monte Carlo method with high temperature molecular dynamics saddle-point search. We examine the evolution of the potential energy landscape under applied strain and identify transient structural excitations as well as stress-activated plastic events (shear transformation zones). We make a distinction between these events and classify them in terms of their barriers and structural changes. Using this data, we gain quantitative insights into the microscopic processes of plastic deformation in metallic glasses, which ultimately lead to the percolation of a shear band.