About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
Precipitate Looping and Shearing at the Nanoscale |
Author(s) |
William A. Curtin, Yi Hu, Daniel Marchand |
On-Site Speaker (Planned) |
William A. Curtin |
Abstract Scope |
Many traditional alloys are strengthened by the controlled formation of coherent in-situ nanoscale precipitates. With nanoscale size and spacing, atomistic resolution can be important but is not computationally feasible in realistic microstructures. Here, we use new machine learning interatomic potentials for Al-Mg-Si, Al-Cu, and Al-Cu-Mg, atomistically-calibrated discrete dislocation dynamics (DDD), and theory to holistically connect macroscopic yield strength to the nanoscale cutting and/or looping of precipitates. We demonstrate previously neglected differences in behavior due to precipitate orientation, which affects dislocation configurations and coherency stresses inside and outside the precipitates. We demonstrate quantitative and qualitative agreement between atomistics, DDD, and theory. We then make quantitative connections to experimentally-measured yield strengths in Al-Mg-Si Al-6xxx alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Modeling and Simulation |