About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Algorithms Development in Materials Science and Engineering
|
Presentation Title |
Critical cross slip stresses in several FCC metals uncovered via phase field dislocation dynamics |
Author(s) |
Ian Wise, Abigail Hunter, Irene Beyerlein |
On-Site Speaker (Planned) |
Ian Wise |
Abstract Scope |
Dislocation-defect interactions are believed to significantly impact temperature-sensitive mechanical behavior in face-centered cubic (FCC) engineering alloys. Cross slip is one such mechanism for screw dislocations to bypass hard obstacles. Here, we study the combination of material properties that control cross slip behavior. To this end, we advance a 3D phase-field dislocation dynamics (PFDD) mesoscale technique to simulate cross slip across a broad range of FCC metals using a consistent method and no adjustable parameters. We incorporate extended, non-co-planar FCC dislocations into PFDD to study cross slip. The reaction into a dissociated dislocation core structure is simulated by incorporating elastic anisotropy and the entire gamma surface from density functional theory. Critical stresses for constriction and cross slip are calculated. Two key stacking fault energies of the gamma surface, as well as the level of elastic anisotropy, are found to play an important role in predicting cross slip. |
Proceedings Inclusion? |
Planned: |