Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 2: Topical Session Glass Dynamics II

MM 2.1: Topical Talk

Montag, 22. März 2010, 12:00–12:30, H16

Nanomechanics of glasses and supercooled melts — •S. G. Mayr — Leibniz-Institut für Oberflächenmodifizierung e.V. — Translationszentrum für regenerative Medizin, Universität Leipzig — Fakultät für Physik und Geowissenschaften, Universität Leipzig

Metallic glasses are characterized by a rather complex viscoelastic response and the occurrence of the glass transition, while the underlying atomistic foundations are still poorly understood. Using a realistic CuTi model glass we employ global and local elasticity tensors for a thorough analysis of relaxation kinetics and mechanical stability at the nanoscale. We obtain strong indication [1] that i) α and β relaxation are closely related, presumably manifestations of a general relaxation scenario, ii) glasses reveal intrinsic mechanical instabilities at the nanoscale, which are closely connected to collective shear events within shear transformation zones and iii) the glass transition can be understood as a percolation transition of these mechanically unstable regions.
S.G. Mayr, Phys. Rev. B 79, 060201(R) (2009)
This research is funded by the German DFG-PAK 36.