About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Dynamic Behavior of Materials IX
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Presentation Title |
In Situ X-ray Diffraction of Sapphire Single Crystals during Laser Compression and Release |
Author(s) |
Anirudh Hari, Saransh Singh, Joel Bernier, Rohit Hari, Raymond F. Smith, Thomas Duffy, Todd Hufnagel, June Wicks |
On-Site Speaker (Planned) |
Anirudh Hari |
Abstract Scope |
Sapphire is an important earth mineral notable for its high compressive strength and hardness. Molecular dynamics simulations find that sapphire shocked to 150 GPa deforms via basal slip and rhombohedral twinning along the {102} family of planes (Kuksin & Yanilkin 2012).
In this work, we describe laser-driven shock compression experiments on a-cut and c-cut sapphire to 150 GPa at the Matter in Extreme Conditions endstation of the Linac Coherent Light Source. Ultrafast x-ray pulses (50 fs, 10^12 photons/pulse) were used to probe the shock response as a function of time, measuring in situ lattice-level response during shock propagation and release. We see evidence of plastic deformation and crystal break-up during compression. After release to ambient pressure, we observe change from large single-crystal spots to a powder texture, indicating further break-up. We will compare and discuss the effects of different orientations and release paths on crystallographic texture. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, High-Temperature Materials, Characterization |