| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Atomistic Investigation of Elementary Dislocation Properties Influencing Mechanical Behaviour of Cr15Fe46Mn17Ni22 Alloy and Cr20Fe70Ni10 Alloy |
| Author(s) |
Ayobami Daniel Daramola, Anna Fraczkiewicz, Ghiath Monnet, Christophe Domain, Gilles Adjanor |
| On-Site Speaker (Planned) |
Ayobami Daniel Daramola |
| Abstract Scope |
Molecular dynamics (MD) simulations were used to study elementary dislocation properties in a high entropy (HEA) model alloy in comparison with Austenitic Stainless Steel (ASS). Recently developed embedded-atom method (EAM) potentials were used to describe the atomic interactions in the alloys. Molecular Statics (MS) calculations were used to study the dislocation properties in terms of local stacking fault energy (SFE. MD was used to investigate the dissociation distance under applied shear stress as a function of temperature and strain rate. It was shown that higher critical stress is required to move dislocations in the HEA alloy compared with the ASS model alloy. The theoretical investigation of the dislocation mobility simulation results shows that a simple constitutive mobility law allows predicting dislocation velocity in both alloys over three orders of magnitude, covering the phonon drag regime and the thermally activated regime induced by dislocation unpinning from local complex configurations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Entropy Alloys, Modeling and Simulation |