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Related Experiment Video

Updated: May 16, 2026

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

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Grain boundary rotations in solids.

S V Bobylev¹, I A Ovid'ko

¹Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Bolshoj 61, Vasilievskii Ostrov, St. Petersburg 199178, Russia.

Physical Review Letters

|December 11, 2012

Summary

Scientists propose a new mechanism for plastic flow in solids involving stress-driven grain boundary (GB) rotations. This theory explains observed GB rotations in nickel, suggesting it

Area of Science:

Solid-state physics
Materials science
Nanomechanics

Background:

Plastic flow in solids is crucial for material deformation.
Understanding the mechanisms of plastic flow at the nanoscale is an ongoing challenge.
Grain boundaries (GBs) play a significant role in material properties and deformation.

Purpose of the Study:

To propose and theoretically describe a new physical mechanism for plastic flow in solids.
To investigate the role of grain boundary rotations in plastic deformation.
To calculate the stress and energy characteristics of these proposed grain boundary rotations.

Main Methods:

Theoretical modeling of stress-driven grain boundary rotations.
Calculation of stress and energy characteristics for grain boundary rotations.

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Comparison of theoretical predictions with experimental data.

Main Results:

A new physical mechanism of plastic flow involving stress-driven grain boundary rotations is proposed.
Calculations show that these rotations are energetically favorable in nickel across a range of grain boundary parameters.
The theoretical model aligns with experimental observations of grain boundary rotations in deformed nanocrystalline nickel.

Conclusions:

Stress-driven grain boundary rotations represent a viable physical mechanism for plastic flow in solids.
This mechanism is particularly relevant for understanding deformation in nanocrystalline materials.
The findings provide a theoretical framework consistent with experimental evidence in nickel.