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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Connection between Mechanical Relaxation and Equilibration Kinetics in a High-Entropy Metallic Glass.

Y J Duan^1,2, M Nabahat², Yu Tong³

¹School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China.

Physical Review Letters

|February 16, 2024

Summary

This study reveals that structural relaxation in high-entropy metallic glasses involves a broad range of activation energies, not just beta relaxation. Stress relaxation correlates with equilibration rates, showing decreased microstructural and increased dynamic heterogeneity.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Physical Chemistry

Background:

Metallic glasses exhibit complex relaxation phenomena during the transition from non-equilibrium states to supercooled liquids.
Understanding the kinetics of structural relaxation is crucial for predicting material properties and stability.

Purpose of the Study:

To investigate the correlation between mechanical relaxation and equilibration kinetics in a specific high-entropy metallic glass (Pd$_{20}$Pt$_{20}$Cu$_{20}$Ni$_{20}$P$_{20}$).
To elucidate the underlying mechanisms of structural relaxation and its distribution of activation energies.

Main Methods:

Detailed analysis of stress relaxation evolution over aging time in the metallic glass.
Correlation of stress relaxation times with equilibration rates.
Assessment of microstructural and dynamic heterogeneity changes during relaxation.

Main Results:

Structural relaxation is characterized by a wide distribution of activation energies, extending beyond the commonly accepted beta relaxation.
A clear correlation was observed between stress relaxation time and the rate of equilibration.
A decrease in microstructural heterogeneity was found to coincide with an increase in dynamic heterogeneity.

Conclusions:

The findings challenge the conventional view of relaxation processes in metallic glasses.
The study provides new insights into the complex interplay between relaxation dynamics and thermodynamics.
This work enhances the understanding of aging and equilibrium-seeking behavior in high-entropy metallic glasses.