| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Interface-related Deformation Phenomena in High Entropy Alloy / Metallic Glass Nanolaminates |
| Author(s) |
Jurgen H. Eckert, Qi Xu, Daniel Sopu, Xudong Yuan, Daniel Kiener |
| On-Site Speaker (Planned) |
Jurgen H. Eckert |
| Abstract Scope |
The deformation behavior of FeCoCrNiAl0.5 high entropy alloy (HEA) / FeCoCrNiAl1.7 metallic glass (MG) nanolaminates is explored through molecular dynamics simulations. Quantitative analysis of atomic strain and dislocation dynamics among competing and cooperative deformation mechanisms is accomplished upon uniaxial tensile deformation. The combination of crystalline and glassy nanolayers biases plastic deformation to regions near the crystalline-glass interface at lower strains, which lowers the activation barrier for dislocation nucleation and propagation. With increasing applied strain, dislocations are absorbed into the glass via slip transfer across the interface, triggering homogeneously distributed shear transformation zones. The competitive deformation mechanisms suppress localized shear bands and increase the resistance to dislocation motion, promoting enhanced ductility. Hence, high strength HEA/MG laminates and their complex deformation behavior may overcome the typical strength-ductility trade-off, rendering them promising candidates for a variety of structural and functional applications. |
| Proceedings Inclusion? |
Planned: |