| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
The Role of Local Chemical Ordering on Diffusion and Deformation Mechanisms in Multi-principal Element Alloys |
| Author(s) |
Penghui Cao |
| On-Site Speaker (Planned) |
Penghui Cao |
| Abstract Scope |
Mechanistic prediction of mechanical behaviors of materials requires a fundamental understanding of the underpinning mechanisms. We will present our findings of diffusion and deformation processes at atomistic to nanoscopic length scales in multi-principal element alloys, using multiscale atomistic simulations coupled with in-situ testing and characterization. Regarding diffusion, we show that the presence of chemical short-range order considerably reduces and localizes vacancy-mediated diffusion. Concerning deformation mechanisms, we integrate atomistic modeling, in-situ SEM straining, and TEM characterization to reveal the role of short-range chemical order on dislocation slip, twinning, and martensitic transformation. The microstructure and local strain evolution resulting from these deformation processes be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Modeling and Simulation |