About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Microstructure-Sensitive Modeling Across Length Scales: An MPMD/SMD Symposium in Honor of David L. McDowell
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| Presentation Title |
Phase Transformations Induced by Large Plastic Deformations Under High Pressure: Four-Scale Theory and Experimental Confirmations |
| Author(s) |
Valery I. Levitas |
| On-Site Speaker (Planned) |
Valery I. Levitas |
| Abstract Scope |
Plastic deformations at high pressure in rotational diamond anvil cell (RDAC) lead to numerous new phenomena, including drastic reduction (up to 100 times) in phase transformation (PT) pressure. Four-scale theory for plastic strain-induced PTs is developed, including molecular dynamics and first-principle simulations, developed nanoscale and scale-free phase-field approaches (PFA), and the behavior of the sample in DAC/RDAC at the macroscale. Combined with in situ x-ray diffraction experiments, the models for plastic flow and strain-induced PTs are developed, calibrated, and verified for α-ω PT in Zr. The suggested dislocation pileup-based nucleation mechanism is confirmed by nanoscale and scale-free PFAs and experiments on PTs in Si. The new mechanism of the deep-focus earthquake utilizing strain-induced olivine-spinel PT and transformation-induced plasticity in shear band is presented and conceptually proved by experiments. The obtained results offer new understanding of strain-induced PTs under pressure and methods of controlling PTs and searching for new phases.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Phase Transformations, Other |