Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.6: Poster

Monday, March 26, 2012, 17:00–19:00, Poster B

Nonlinear response of metallic glasses at high applied stresses and nonlinear effects of damping behaviour below to above the glass transition temperature — •Antje Krüger, Moritz Schwabe, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The α- and β-processes in metallic glasses can be described within the model of the potential energy landscape (PEL). These processes illustrate barriers for a change of local configurations and can be varied by external stresses. When applying a constant stress the sample responds in a combination of different behaviours, elastic, anelastic and plastic.

In the previous work we studied the anelastic contribution in order to obtain information about the damping behaviour. The results showed an exponential correlation to temperature and stress [1]. Now, we also can estimate the activation volume of the α- as well as the β-process using these creep-recovery-methods [2]. Furthermore we investigate in the viscous flow the Newtonian and non-Newtonian behaviour when increasing the elastic strain σ₀/E. This can be compared to well known results in polymers, granular and colloidal systems. Work supported by FOR1394 and GRK782.

[1] M. Schwabe, D. Bedorf and K. Samwer, The European Physical Journal E (2011), 34, 91

[2] M. Schwabe, S. Küchemann, H. Wagner, D. Bedorf and K. Samwer, Journal of Non-Crystalline Solids (2010), 357, 490-493