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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Correlation between Viscoelastic Moduli and Atomic Rearrangements in Metallic Glasses
Hai-Bin Yu1, Ranko Richert2, Konrad Samwer3
1Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , WuHan 430074, China.
The Journal of Physical Chemistry Letters
|September 9, 2016
Summary
The storage and loss moduli in metallic glasses are determined by atomic nonaffine displacements, not fast-moving atoms. This finding clarifies the origin of viscoelasticity in these materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Rheology
Background:
- Dynamical moduli (storage and loss moduli) describe material viscoelasticity and relaxation processes in glasses and supercooled liquids.
- Understanding the fundamental determinants of these moduli in glassy materials is a key scientific challenge.
Purpose of the Study:
- To identify the primary factors governing storage and loss moduli in model metallic glasses.
- To elucidate the relationship between atomic displacements and viscoelastic properties.
Main Methods:
- Investigated several model metallic glass systems.
- Analyzed atomic nonaffine displacements and their correlation with dynamical moduli.
- Examined the contribution of fast-moving atoms to viscoelastic behavior.
Main Results:
- Storage and loss moduli are uniquely determined by the most probable atomic nonaffine displacements.
- Temperature and frequency do not explicitly influence this determination.
- Fast-moving atoms, despite contributing to dynamical heterogeneity, do not directly impact the moduli.
Conclusions:
- Atomic nonaffine displacements provide a fundamental physical basis for viscoelasticity in metallic glasses.
- This work offers a new perspective on the microscopic origins of material response in glassy systems.
- The findings simplify the understanding of viscoelastic behavior by linking it to specific atomic motion characteristics.
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