Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 27: Liquid and Amorphous Metals II
MM 27.4: Vortrag
Mittwoch, 27. Februar 2008, 16:30–16:45, H 0107
Dynamics of Shear Transformation Zones in Metallic Glasses — •Max Neudecker and S. G. Mayr — I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Dynamical heterogeneities in metallic glasses are investigated for the model glass, Cu50Ti50, with the help of classical molecular dynamics computer simulations. By rapid quenching from melt at various cooling rates (comprising 5 orders of magnitude), differently relaxed amorphous cells are prepared. During a subsequent shearing, macroscopic properties (particularly the stress-strain curve) are linked to microscopic dynamics. We find the global shearing is composed of highly localized shear events, termed shear transformation zones (STZs), which occur spatially and temporally inhomogeneously. A detailed analysis focuses on the origins and implications of STZ formation.
Financial support by SFB 602 (project B3) is gratefully acknowledged.