Zusammenfassung für den Vortrag am 23.06.2015 (16:00 Uhr)

Colloquium of the Faculty of Physics and Geosciences

Helmar Teichler (Georg-August-University, Goettingen)
Correlated Atomic Dynamics in Metallic Glass Forming Systems - Messages from Computer Simulations

Due to their amorphous structure, finite temperature glass-forming melts and glasses show a

competition between an immense number of atomic arrangements, a feature not found in a

similar pronounced way in crystalline samples. Changes between the arrangements lead to

sluggish, non-exponential decay of configurations, typical for this class of materials and

leading to glass formation. For metallic glasses and their melts, we consider findings from

actual computer simulations of glass dynamics, which allow relating the time-decay

characteristics of configurations with structural changes on the microscopic, atomistic level.

Thereby we bridge more than eight orders in time, from atomic vibrations on the sub-pico

second range to meso-scale micro second evolutions. In the presentation, key topics are shortand

medium-range order of the amorphous structure, basic vibration induced excitations, the

accumulation principle, and structure conserving correlations between excitations.