Physics

Size-dependent vitrification in metallic glasses

V. D. Lisio, I. Gallino, et al.

This groundbreaking study delves into the size-dependent vitrification behavior and atomic mobility of Au and Pt-based metallic glasses, revealing significant insights about vitrification kinetics in micrometer-sized glasses. Conducted by a team of researchers including Valerio Di Lisio and Isabella Gallino, the findings hint at new pathways to achieving low-energy states in metallic glasses.... show more

Abstract

Reducing the sample size can profoundly impact properties of bulk metallic glasses. Here, we systematically reduce the length scale of Au and Pt-based metallic glasses and study their vitrification behavior and atomic mobility. For this purpose, we exploit fast scanning calorimetry (FSC) allowing to study glassy dynamics in an exceptionally wide range of cooling rates and frequencies. We show that the main α relaxation process remains size independent and bulk-like. In contrast, we observe pronounced size dependent vitrification kinetics in micrometer-sized glasses, which is more evident for the smallest samples and at low cooling rates, resulting in more than 40 K decrease in fictive temperature, Tf, with respect to the bulk. We discuss the deep implications on how this outcome can be used to convey glasses to low energy states.

Publisher

Nature Communications

Published On

Aug 04, 2023

Authors

Valerio Di Lisio, Isabella Gallino, Sascha Sebastian Riegler, Maximilian Frey, Nico Neuber, Golden Kumar, Jan Schroers, Ralf Busch, Daniele Cangialosi

DOI

https://doi.org/10.1038/s41467-023-40417-4

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