About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Universal Transition in Segregation Structures near Twin-boundary Disconnections |
Author(s) |
Chongze Hu, Stéphane Berbenni, Douglas Medlin, Remi Dingreville |
On-Site Speaker (Planned) |
Chongze Hu |
Abstract Scope |
Twinning is a major deformation mechanism in nanocrystalline metals, and segregation of solute atoms at twin boundaries is a thermodynamic process that controls their stability and strengthening. In pristine, defect-free twin boundaries, solute segregation is generally uniform and symmetric across the boundary. However, when a disconnection, a type of interfacial line defect, is present, we report a universal segregation transition phenomenon for a broad range of binary alloys with different segregation structures. This transition in the segregation structure is explained by a break of the local symmetry across the disconnection terraces. Characteristics of the transition from one segregation structure to another are dictated by the orientation and character of the dislocation content of the disconnection, driven by changes in the local hydrostatic pressure field and local segregation volume in the vicinity of the boundary. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Other |