| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
Strain-induced phase separation and mesocrystal formation in refractory HEAs |
| Author(s) |
Shalini Roy Koneru, Jongjie Hu, Jian-Feng Nie, Hamish Fraser, Yunzhi Wang |
| On-Site Speaker (Planned) |
Yunzhi Wang |
| Abstract Scope |
The elastic energy of a solid solution with atoms of significantly different sizes has been extensively studied to understand strain-induced phase transformations observed experimentally. Eshelby’s theory states that in an elastically isotropic system, the elastic energy of a multi-component system depends solely on the total number of solute atoms, not their spatial arrangement. However, in elastically anisotropic systems like refractory high-entropy alloys (HEAs), the elastic energy of a homogeneous random solid solution is higher than that of a heterogeneous system where solute atoms of different sizes form different phases aligned along elastically “soft” directions. This presentation demonstrates that strain-induced phase separation and phase-separation-induced structural transformation lead to the formation of various mesocrystals and nanoarchitectures observed experimentally in refractor HEAs whose lattice parameters and elastic constants have nonlinear dependence on composition. These findings offer new directions for microstructure design in compositionally complex alloys by utilizing specific strain-induced solid-state phase transformation pathways. |
| Proceedings Inclusion? |
Planned: |