Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Postersitzung I

MM 12.2: Poster

Montag, 14. März 2011, 17:30–19:00, P5

Nonlinear effects of damping behavior and activation volume of metallic glasses below to above the glass transition temperature — •Moritz Schwabe, Dennis Bedorf, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The idea of a potential energy landscape (PEL) from Stillinger and Weber describes relaxation processes in two ways of stimulation: α-relaxations as a changeover to a new metabasin and β-relaxation as changes within the fine structure of the metabasin. External stress can vary these barriers as discussed by W.L. Johnson and K. Samwer. [1,2] With this background we analyzed creep- recovery measurements at constant temperature to investigate the damping behavior of amorphous PdCuSi below Tg. Furthermore we compare the relation of the glass transition temperature and the apparent activation volume for plastic deformation to external stress and temperature of the fragile glass former PdCuSi and the strong ZrAlCu. Then an exponential, multiplicative relationship of stress and temperature dependence can be suggested. [3] [1] P.G. Debenedetti and F.H. Stillinger, Nature, 2001, 410, 259 [2] W.L. Johnson and K. Samwer, Physical Review Letters, 2005, 95, 195501 [3] M. Schwabe, S. Küchemann, H. Wagner, D. Bedorf and K. Samwer, Journal of Non-Crystalline Solids, doi:10.1016/j.physletb.2003.10.071