Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 40: Liquid and Amorphous Metals

MM 40.1: Vortrag

Donnerstag, 4. April 2019, 15:00–15:15, H46

Long-range strain correlations in 3D quiescent glass forming liquids — •Muhammad Hassani and Fathollah Varnik — ICAMS, Ruhr-Universität Bochum, 44801, Bochum, Germany

Recent 2D computer simulations and experiments indicate that supercooled liquids and glasses exhibit long-lived, long-ranged strain correlations in the unperturbed quiescent state [1, 2]. Here we investigate this issue in three dimensions via molecular dynamics simulations of a glass forming binary Lennard Jones mixture. Both in the glassy state and in the supercooled regime, strain correlations are found to decay with a 1/r³ power-law behavior, reminiscent of elastic field around an inclusion. Moreover, theoretical predictions on the time dependence of the correlation amplitude are in line with the results obtained from simulations. It is argued that the size of the domain, which exhibits a "solid-like" strain pattern in a supercooled liquid, is determined by the product of the speed of sound with the structural relation time. While this length is of the order of nanometers in the normal liquid state, it grows to macroscale when approaching the glass transition [3, 4].

[1] B. Illing, S. Fritschi, D. Hajnal, C. Klix, P. Keim, and M. Fuchs, Phys. Rev. Lett. 117, 208002 (2016).

[2] K.E. Jensen, D.A. Weitz and F. Spaepen, Phys. Rev. E 90, 042305, (2014).

[3] M. Hassani, P. Engels, and F. Varnik, Europhys. Lett., 121(1):18005, (2018).

[4] M. Hassani, E. M. Zirdehi, K. Kok, P. Schall, M. Fuchs, and F. Varnik, Europhys. Lett., 124(1):18003, (2018).