| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Fundamental Deformation Mechanisms in Metals with Gradient Structure and 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 deformation mechanisms. We will discuss our findings of deformation processes at atomistic to nanoscopic scales in two classes of materials - gradient nano-grained metals and multi-principal element alloys, using multiscale atomistic simulations coupled with in-situ testing and characterization. We show that, for gradient nanostructured copper, increasing the degree of structure gradient can promote dislocation-mediated intragranular plasticity and mitigate the grain boundary-mediated softening. Concerning multi-principal element alloys, 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 as a result of these deformation processes will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, High-Entropy Alloys, Mechanical Properties |