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High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
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Twinning and Dislocation Evolution during Shock Compression and Release of Single Crystals: Real-Time X-Ray
Stefan J Turneaure1, P Renganathan1, J M Winey1
1Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA.
Physical Review Letters
|July 14, 2018
Summary
Understanding plastic deformation in single crystals under shock loading is crucial. This study reveals that magnesium single crystals exhibit twinning during stress release, not during compression, distinguishing deformation mechanisms on nanosecond timescales.
Area of Science:
- Materials Science
- Solid Mechanics
- Crystallography
Background:
- Understanding plastic deformation mechanisms in single crystals under dynamic loading is critical.
- Noncubic crystals present complexities due to multiple competing slip and twinning systems.
- Real-time, nanosecond-timescale characterization of deformation is essential.
Purpose of the Study:
- To determine the temporal evolution of twinning and dislocation slip in magnesium single crystals under shock wave loading.
- To distinguish between slip and twinning mechanisms on nanosecond timescales.
- To investigate deformation behavior during shock compression and release along the c-axis.
Main Methods:
- In situ, time-resolved synchrotron Laue X-ray diffraction.
- Plane shock wave loading experiments.
- Shock compression and release of magnesium single crystals.
Main Results:
- Dislocation slip was observed during the compression phase.
- Significant twinning was directly observed during the stress release phase.
- The study successfully distinguished between twinning and dislocation slip on nanosecond timescales.
Conclusions:
- The temporal evolution of deformation mechanisms in shocked hexagonal-close-packed metals can be resolved.
- Twinning in magnesium single crystals under c-axis shock loading primarily occurs during stress release.
- This work provides critical insights into dynamic plastic deformation of noncubic metals.
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