About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Severe Plastic Strain-Driven Phase Transformations and Microstructure Evolution under High Pressure: New Rules |
| Author(s) |
Valery I. Levitas |
| On-Site Speaker (Planned) |
Valery I. Levitas |
| Abstract Scope |
New in situ experimental results are obtained under heterogeneous compression of materials in a diamond anvil cell (DAC) and torsion in dynamic rotational DAC (dRDAC). Materials under study include carbon, Zr, Si, and Fe and its alloys. Drastic reductions (by one to two orders of magnitude) of the phase transformation (PT) pressure compared with hydrostatic loading and the appearance of new phases are demonstrated. It is found that after severe plastic straining, the yield strength, dislocation density, crystallite size, and minimum pressure for strain-induced PT are getting independent of plastic strain tensor and its path during and after strain-induced α-ω transformation in Zr. During α-ω PT, dislocation density and crystallite size are growing functions of the volume fraction of ω-Zr only. Theoretically predicted correlation between the direct and inverse Hall-Petch effect of particle size on yield strength and pressure for strain-induced PT is confirmed experimentally for Si-I→Si-II PT. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Other, Other |