Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 43: Liquid and Amorphous Metals II
MM 43.2: Vortrag
Donnerstag, 26. März 2009, 16:15–16:30, IFW A
Dynamics of shear localization and stress relaxation in amorphous Cu50Ti50 — •Max Neudecker and S. G. Mayr — I. Physikalisches Institut, Georg-August-Universitaet Goettingen, Friedrich-Hund-Platz 1, 37077 Göttingen
Dynamic heterogeneities of atomic mobility 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 subsequent shearing, we observe a series of highly localized shear events, termed shear transformation zones (STZs). Detailed analysis focuses on geometrical shape and size of STZs, mechanical stress dynamics and correlations of mobility with local properties. We identify a local stress bias as physical origin of STZ formation during during low temperature deformation. Further investigations concern the characterization and analysis of heterogeneous mobility and stress dynamics during shearing at higher temperatures.
[1] M. Neudecker and S. G. Mayr, Acta Materialia, in press (2008) Financially supported by the DFG (PAK 36)