Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 6: Liquid and Amorphous Metals II: Shear bands

MM 6.6: Vortrag

Montag, 7. März 2016, 12:45–13:00, H52

Avalanches upon the deformation process in metallic glasses — •Carlos Herrero-Gomez and Konrad Samwer — I Physikalisches Institut, Universität Göttingen

Bulk metallic glasses respond with elastic and/or plastic deformation to applied mechanical stresses. Such deformation is not a smooth response to the applied stress but instead take place via jerky jumps, which are often referred as Crackling Noise [1].

We report a statistical analysis of the crackling noise produced by metallic glasses during creep measurements. We present a waiting time analysis of such measurements. Such analysis reveals that the waiting time distribution follows a power law, in the same fashion of simulations and experiments of avalanche dynamics [2,3]. Furthermore, the study shows the existence of a crossover in the waiting times distribution [4]. The crossover was interpreted as a change in the deformation process. We performed a systematic analysis for different experimental conditions, to analyze the influence of the stress and temperature on the avalanche dynamics.

Financial support by the ITN-FP7 Marie Sklodowska-Curie program VitriMetTech N. 607080 is thankfully acknowledged .

[1] K. Dahmen, Y. Ben-Zion and J.T. Uhl. Phys Rev Let.102, 175501 (2009) [2] M.C: Kuntz, and J.P. Sethna. Phys. Rev. B, 62, 17 (2000) [3] J. Antonaglia, W.J. Wright, X.G. Ru, G.R. Byer, T. C. Hufnagel, M.Leblanc, J.T.U. and K.A. Dahmen.Phys. Rev. Let. 112, 155501 (2014) [4] J.O Krisponeit, S. Pitikaris, K.E.Ávila, S.Küchemann, A.Krüger and K. Samwer. Nat. Commun. 5, 3616 (2014)