Stretched and compressed exponentials in the relaxation dynamics of a metallic glass-forming melt

TL;DR

This study uses computer simulations to link the complex relaxation dynamics of metallic glass-formers to their microscopic icosahedral structures, revealing coexistence of different relaxation behaviors that influence their mechanical properties.

Contribution

It establishes a direct connection between local icosahedral arrangements and distinct relaxation behaviors in metallic glasses through simulation analysis.

Findings

Isolated icosahedra cause stretched exponential relaxation.

Clusters of icosahedra lead to compressed exponential relaxation.

Relaxation dynamics are influenced by local structural arrangements.

Abstract

The relaxation dynamics of glass-forming systems shows a multitude of features that are absent in normal liquids, such as non-exponential relaxation and a strong temperature-dependence of the relaxation time. Connecting these dynamic properties to the microscopic structure of the system is very challenging because of the presence of the structural disorder. Here we use computer simulations of a metallic glass-former to establish such a connection. By probing the temperature and wave-vector dependence of the intermediate scattering function we find that the relaxation dynamics of the glassy melt is directly related to the local arrangement of icosahedral structures: Isolated icosahedra give rise to a flow-like stretched exponential relaxation whereas clusters of icosahedra lead to a compressed exponential relaxation that is reminiscent to the one found in a solid. Our results show that in metallic glass-formers these two types of relaxation processes can coexist and give rise to a surprisingly complex dynamics, insight that will allow to get a deeper understanding of the outstanding mechanical properties of metallic glasses.