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Updated: Jul 2, 2026

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

Stability map for nanocrystalline and amorphous materials.

Shailendra P Joshi¹, K T Ramesh

¹Department of Mechanical Engineering, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.

Physical Review Letters

|September 4, 2008

Summary

This summary is machine-generated.

This study introduces a stability map to predict shear instability in nanocrystalline materials. The map identifies grain size regimes susceptible to grain rotation, aiding material design for enhanced stability.

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Area of Science:

Materials Science
Nanotechnology
Mechanical Engineering

Background:

Nanocrystalline materials exhibit unique mechanical properties influenced by grain size and intergranular interactions.
Shear instability, driven by grain rotation, is a critical failure mechanism in these materials.
Understanding the onset and prevalence of shear instability is crucial for designing robust nanomaterials.

Purpose of the Study:

To develop a predictive stability map for shear instability in nanocrystalline materials.
To elucidate the influence of grain-size-dependent mechanisms and intergranular interaction length-scales on shear instability.
To identify specific grain size regimes susceptible to shear-induced instability.

Main Methods:

Development of a theoretical model to predict shear instability domains.
Inclusion of grain-size-dependent mechanisms and intergranular interaction length-scales in the model.
Generation of a stability map illustrating susceptible grain size regimes across various materials.

Main Results:

The stability map successfully predicts domains of shear instability due to grain rotation.
The onset of instability is shown to be dependent on grain size and intergranular interaction length-scale.
In the amorphous limit, predicted embryonic nuclei sizes (10-50 nm) correlate with observed shear band thicknesses in metallic glasses.

Conclusions:

The developed stability map is a valuable tool for predicting shear instability in nanocrystalline materials.
The findings provide insights into the fundamental mechanisms governing shear instability.
The model's predictions align with experimental observations, particularly for metallic glasses, validating its utility.