Dresden 2017 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 66: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses VI - mechanical properties
MM 66.3: Vortrag
Donnerstag, 23. März 2017, 16:30–16:45, IFW A
microstructural fluctuations at equilibrium and under tensile deformation of a Cu-Zr model glass by molecular dynamics simulations — •pablo palomino rico1, dimitris papageorgiou2, and giorgos evangelakis1 — 1Department of Physics, University of Ioannina, Ioannina 45110 Greece — 2Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece
We present Molecular Dynamics Simulations results referring to microstructural fluctuations of a Cu65Zr35 computer glass at equilibrium and under tensile deformation. We found that at equilibrium the atoms perform short distance atomic displacements, which are not homogeneously distributed along the system, showing high and low mobility zones, and take place with the concomitance of 2 or 3 neighboring atoms, resulting in local changes of the microstructure. Inspection of the potential energy landscape of the process indicates the presence of a β-relaxation event. Under tensile deformation, those movements increase in number and distance, the high mobility zones group larger number of particles participating in such displacements and furthermore, they contribute by as much as 40% in the accommodation of the volume gain that takes place during the straining process through clusters* transformations of Icosahedra to Dodecahedra or Cuboctahedra. These results could be useful in the understanding of phenomena like aging and creep relaxation in Metallic Glasses.