About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Role of Residual Dislocation Burgers Vector Magnitude and Mobility on Grain Boundary Slip Transfer in Aluminum |
Author(s) |
Douglas E. Spearot, Rodrigo Santos-Guemes, Javier Llorca |
On-Site Speaker (Planned) |
Douglas E. Spearot |
Abstract Scope |
The interactions between dislocations and grain boundaries are key mechanisms that control strength, hardening and ductility in metallic polycrystalline materials. It is known that favorable geometric alignment between incoming and transmission slip systems can promote slip transfer, for example, when the Burgers vector of the residual dislocation formed at the grain boundary is small. Yet, the influence of residual dislocation mobility on slip transmission is unknown. Thus, in this work, discrete dislocation dynamics simulations are conducted to isolate the roles of the residual dislocation Burgers vector magnitude and mobility on the critical shear stress necessary for slip transmission. A novel bisection algorithm is developed that employs the swept area by dislocations to automatically identify stable transmission across a grain boundary and to automate the sampling of stress states. Simulations show a correlation between the critical shear stress for transmission and the residual dislocation Burgers vector magnitude. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Other |