Anomalous structure-property relationships in metallic glasses through pressure-mediated glass formation

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Original languageEnglish
Article number140204
Journal / PublicationPhysical Review B
Volume93
Issue number14
Online published8 Apr 2016
Publication statusPublished - Apr 2016
Externally publishedYes

Abstract

Metallic glasses are commonly found to favor denser packing structures and icosahedral order in experiments, simulations, and theoretical models. Here we present a molecular dynamics simulation study of Cu-Zr metallic glasses, prepared through a pressure-mediated pathway. The resulting glasses exhibit anomalous structure-property relationships; these glasses are less energetically stable, concomitant with a denser atomic packing and a significant increase in icosahedral short-range order. The enhanced icosahedral order is shown to be accompanied by a pressure-mediated change in chemical short-range order. The results demonstrate that in amorphous alloys (nonmonatomic), theoretical frameworks of the two-order-parameter model must be generalized to account for chemical degrees of freedom.