Short-range-order lifetime and the "boson peak" in a metallic glass model.
We extend the usual static view of short range order in metallic glasses to a dynamical model of local order. We use an atomistic simulation of a NiZr glass to investigate time-dependent fluctuations of the atomic environment. We show that, even in the "frozen" glass, the solute-centered clusters change their identities between distinct polyhedron types. The frequency spectrum of these transitions exhibits a characteristic peak which we show to be related to a universal vibrational anomaly of disordered solids: the controversial boson peak.
Guerdane
M
M
Institut für Materialphysik, Universität Göttingen, 37077 Göttingen, Germany. hamid@ump.gwdg.de
Teichler
H
H