| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Structures and Modeling
|
| Presentation Title |
Deformation Behavior of a Model High Entropy Alloy from Atomistic Simulations |
| Author(s) |
Diana Farkas |
| On-Site Speaker (Planned) |
Diana Farkas |
| Abstract Scope |
This paper reports atomistic simulation studies of deformation behavior in a model quinary high entropy FCC alloy. The simulations are based on empirical interatomic potentials and use massively parallel molecular dynamics techniques at the atomistic level to study the deformation mechanisms. Virtual tensile tests were performed and the material response and the results are compared with a corresponding “average atom” material that has the same average properties but no local randomness. We find that the main effect of the random composition fluctuations is to make dislocation glide more difficult. The complex high entropy alloy presents a higher strength, mostly driven by the fact that the dislocations emitted from the grain boundaries do not glide as easily in the random alloy. Simulations of fracture propagation are also presented, showing a higher fracture resistance in the HEA material than in the corresponding material without compositional fluctuations. |
| Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |
| Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, Mechanical Properties |