About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
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| Presentation Title |
Diamond in extreme laser-induced shock compression: experiments and modeling |
| Author(s) |
Marc Meyers, Alex Li, Boya Li, Robert E Rudd, Eduardo Marcial Bringa, Sheron Stephany Tavares |
| On-Site Speaker (Planned) |
Marc Meyers |
| Abstract Scope |
Diamond is an important capsule material in the generation of energy by fusion of tritium and deuterium at the National Ignition Facility (LLNL). Defects may affect the deformation pattern, compression symmetry, and deleterious mixing by generating localized shear.
High-power, pulsed, laser-driven shock compression experiments conducted on monocrystalline diamond at a pressure of 115 GPa and pulse duration of 1 ns reveal stacking faults, dislocations, nano-twins and amorphous bands. The amorphous bands are extremely localized and a few nanometers.
Molecular dynamics simulations show that the threshold for dislocation emission from voids decreases with increasing void diameter, from a shock stress of 232 GPa for a 2-nm void to 135 GPa for 18-nm . An analytical model is developed to capture the behavior of diamond’s plasticity dependent upon the void size. Shock-induced amorphization is proposed as a new deformation mechanism of diamond under extremely high strain rate deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Ceramics, Phase Transformations |