Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and Amorphous Metals I

MM 4.5: Vortrag

Montag, 14. März 2011, 12:00–12:15, IFW D

Local mechanical spectroscopy on confined structures of metallic glasses — •Dennis Bedorf, Bo Zhang, Hannes Wagner, Moritz Schwabe, Walter Arnold, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen,Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Our aim is to investigate the local heterogeneity of glasses with an experimental approach. Up to now most of the knowledge about dynamical heterogeneities, like shear-transformation zones or string-like rearrangements, is based on computer studies. An atomic force based method which exploits contact-resonances of the cantilever, also called AFAM [1], enables us to study the elastic response and also anelastic losses on the nm-scale. Recent results have revealed a broad distribution of local moduli for amorphous PdCuSi on this length scale. Motivated by these findings we adopt this method to study size effects in glasses using nanoscaled samples prepared by lithography. First results indicate a significant softening for smaller samples.

[1] M. Kopycinska-Müller, and W. Arnold et al, Z. Phys. Chem. 222, 471 (2008)