| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Solid Phase Processing Symposium
|
| Presentation Title |
Phase Transformations Induced by Large Plastic Deformations under High Pressure: Four-Scale Theory and in Situ Experiments |
| Author(s) |
Valery I. Levitas |
| On-Site Speaker (Planned) |
Valery I. Levitas |
| Abstract Scope |
Superposing large plastic shear on high pressure in rotational diamond anvil cell (RDAC) leads to numerous new phenomena, including drastic reduction in phase transformation (PT) pressure and appearance of new phases. Here, recent advances in our four-scale theory, corresponding simulations, and in situ XRD experiments for plastic strain induced PTs will be presented. Atomic simulations were used to determine crystal lattice instability conditions under action of all six components of the stress tensor. At the nano- and microscales, coupled evolution of PT and dislocations is studied utilizing developed nano- and microscale phase field approaches, leading to microscale kinetic equation. This equation is utilized in the large-strain macroscopic theory for coupled PTs and plasticity. At the macroscale, the behavior of the sample in RDAC is studied using finite element approach. The obtained results offer new understanding of strain-induced PTs under pressure and methods of controlling PTs and searching for new phases. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |