About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Multi-Principal Element Alloys III: Mechanical Behavior
|
Presentation Title |
Competition between 110 and 112 Slip in BCC High Entropy Alloys |
Author(s) |
William A. Curtin, Xin Liu |
On-Site Speaker (Planned) |
William A. Curtin |
Abstract Scope |
Plasticity in BCC alloys is observed to occur on several different slip systems. Here, we examine the strengthening of edge dislocation slip on 110 and 112 slip planes using an elasticity theory with atomistic core structures. Atomistic edge dislocation core structures for the BCC elements Nb, Ta, Mo, and W are first created using machine-learned interatomic potentials, with some validations against first-principles studies. A theory for random alloy yield strength is then applied wherein the solute/dislocation interactions are computed using the dislocation pressure field and solute misfit volume. Application to 110 and 112 dislocations reveals zero temperature strengthening and energy barrier that are remarkably similar. While non-elastic solute/dislocation interactions may differentiate the strengths, the dominant elasticity effects indicate that 110 and 112 slip have comparable strengths and so could both be observed in alloys where strength is controlled by edge dislocations. Connections to recent experiments in HEAs are then discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Computational Materials Science & Engineering, Mechanical Properties |