Size-dependent vitrification in metallic glasses

Valerio Lisio, Isabella Gallino (), Sascha Sebastian Riegler, Maximilian Frey, Nico Neuber, Golden Kumar, Jan Schroers, Ralf Busch and Daniele Cangialosi ()
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Valerio Lisio: Donostia International Physics Center
Isabella Gallino: Saarland University, Chair of Metallic Materials
Sascha Sebastian Riegler: Saarland University, Chair of Metallic Materials
Maximilian Frey: Saarland University, Chair of Metallic Materials
Nico Neuber: Saarland University, Chair of Metallic Materials
Golden Kumar: Department of Mechanical Engineering, University of Texas at Dallas
Jan Schroers: Yale University, Mechanical Engineering and Materials Science
Ralf Busch: Saarland University, Chair of Metallic Materials
Daniele Cangialosi: Donostia International Physics Center

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40417-4

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