| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Thermodynamics and Kinetics
|
| Presentation Title |
Localized Phase Equilibria and Dynamic Phase Transformations at Extended Defects – a New Alloy Design Strategy for Unprecedented Properties |
| Author(s) |
Longsheng Feng, Yipeng Gao, Dong Wang, Yufeng Zheng, Michael J Mills, Hamish F Fraser, Yunzhi Wang |
| On-Site Speaker (Planned) |
Yunzhi Wang |
| Abstract Scope |
Extended defects in crystalline solids such as dislocations, grain boundaries, stacking faults, and deformation twins may alter phase equilibria and change phase transformation behavior. The recent discovery of dynamic phase transformations at extended defects has attracted a lot of attention. They have been shown to have the ability to (a) significantly improve the high-temperature creep performance of Ni-base superalloys and, (b) make metastable beta Ti-alloys ultralow modulus and non-hysteretic, linear superelastic. In this presentation, we analyze fundamental characteristics of such localized phase equilibria and dynamic phase transformations at stacking faults and deformation twin boundaries and their impact on the mechanical behavior of these alloys using a combined CALPHAD, phase transition graph (PTG) and phase field approaches. This study may shed light on employing novel processing routes to stabilize nano precipitate structures, thereby providing new strengthening and deformation mechanisms for these alloys. The work is supported by NSF under DMREF programs. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |