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DF: Fachverband Dielektrische Festkörper

DF 5: Glass I (joint session with DY)

DF 5.1: Vortrag

Dienstag, 27. März 2007, 10:00–10:15, H23

Connection of the slow β-relaxation and physical aging in metallic glasses — •Jörg Hachenberg, Dennis Bedorf, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Metallic glasses are commonly used as model systems for glassy dynamics. This is due to the fact that their interactions can be simplified as such of hard spheres. Special attention has been attracted by recent experimental studies [1] and computer simulations [2] revealing the existence of a secondary, slow β-relaxation as a universal feature of the glass transition. Here, heat rate dependant mechanical spectroscopy is used to investigate the connection between this β-relaxation and physical aging, commonly described as a change in fictive temperature. The close dependence of both phenomena can be interpreted as a single relaxation showing up on two timescales (heating rate resp. spectroscopy frequency). It is proposed that both phenomena share a common origin.

This work is supported by DFG, Graduiertenkolleg 782 and SFB 602, TP B8.

[1] J. Hachenberg, K. Samwer, J. Non-Cryst. Sol. 352, 5110 (2006)

[2] H. Teichler, Phys. Rev. E 71, 031505 (2005)