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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Scaling law for crystal nucleation time in glasses
Anatolii V Mokshin1, Bulat N Galimzyanov1
1Kazan Federal University, 420000 Kazan, Russia.
The Journal of Chemical Physics
|March 16, 2015
Summary
High pressure accelerates structural ordering in glasses, revealing a nucleation mechanism observable on experimental timescales. This process follows a power-law dependence on reduced temperature, consistent across simulations and experiments near the glass transition.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Glassy systems exhibit slow evolution to ordered states due to high viscosity.
- Understanding structural ordering dynamics is crucial for predicting glass behavior.
Purpose of the Study:
- To investigate structural ordering in glasses under high pressure conditions.
- To identify the mechanism driving structural ordering in supercooled glasses.
- To establish a scaling relationship for nucleation time in glassy systems.
Main Methods:
- Molecular dynamics simulations of model glassy systems.
- Analysis of structural ordering over experimental timescales.
- Investigation across a wide range of temperatures and high pressures.
Main Results:
- Structural ordering becomes observable at finite timescales under high pressure.
- Nucleation mechanism initiates and spreads structural ordering, even at deep supercooling.
- Nucleation time scales with reduced temperature via a power-law relationship.
Conclusions:
- High pressure significantly influences the kinetics of structural ordering in glasses.
- The identified nucleation and scaling behavior provide a predictive framework for glass dynamics.
- Findings are consistent with both simulation data and experimental observations near the glass transition.
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