About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
The Evolution of Deformation Twinning in a Heterogeneous Planar Fault Energy Landscape |
Author(s) |
Ritesh Jagatramka, Matthew Daly |
On-Site Speaker (Planned) |
Ritesh Jagatramka |
Abstract Scope |
Recent studies have revealed that chemical fluctuations in concentrated FCC solid solutions give rise to a “local” stacking fault energy. Our work has shown that these fluctuations extend to the entire generalized planar fault energy (GPFE) landscape, creating a spatially heterogeneous topology for the operation of deformation mechanisms. Here, we examine the implications of these fluctuations on the evolution of deformation twinning in FCC solid solutions using the kinetic Monte Carlo (kMC) method. This approach leverages calculations of the local GPFE to provide kinetically-weighted predictions for the nucleation and thickening of deformation twins. Our analysis reveals the distinct differences in morphologies that arise in solid solutions when compared to similar systems under the virtual crystal approximation. The results of this analysis are independently verified using molecular dynamics simulations. In addition, we incorporate statistical fluctuations in the GPFE into an analytical criterion that predicts the effective barriers for deformation twinning processes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nanotechnology, Modeling and Simulation, Mechanical Properties |