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Mechanical Twinning is a Correlated Dynamic Process
A Vinogradov1,2, E Agletdinov3, D Merson3
1Department of Mechanical and Industrial Engineering, Norwegian University of Technology - NTNU, Trondheim, 7491, Norway. alexei.vinogradov@ntnu.no.
Scientific Reports
|April 10, 2019
Summary
This study reveals distinct acoustic emission patterns during plastic deformation. Mechanical twinning exhibits memory effects, unlike independent dislocation slip events, offering insights into material dynamics.
Area of Science:
- Materials Science
- Solid Mechanics
- Acoustics
Background:
- Plastic deformation and fracture generate acoustic emissions (AE), which are elastic wave transients.
- Understanding the dynamics of deformation mechanisms like dislocation slip and mechanical twinning is crucial for material design.
Purpose of the Study:
- To develop and apply a novel methodology for analyzing AE signals to differentiate between twinning and dislocation slip dynamics.
- To investigate the temporal correlations and intrinsic dynamics of these deformation processes.
Main Methods:
- A complex methodology combining statistical analysis of AE event time intervals and unsupervised cluster analysis of time series.
- Application of the methodology to AE signals from a magnesium alloy undergoing plastic deformation.
Main Results:
- Mechanical twinning was identified as a non-Poisson process with memory in the millisecond range.
- Dislocation slip was characterized as a Poisson process, indicating independent source events.
Conclusions:
- The study successfully differentiated the temporal dynamics of mechanical twinning and dislocation slip using AE analysis.
- AE analysis provides a powerful tool for understanding the fundamental mechanisms governing material deformation.
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