About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
CRSS Determination in α-Titanium: Skewed Dislocation Core Structures |
Author(s) |
Orcun Koray Celebi, Gorkem Gengor, Tolga Berkay Celebi, Ahmed Sameer Khan Mohammed, Ashley Bucsek, Huseyin Sehitoglu |
On-Site Speaker (Planned) |
Orcun Koray Celebi |
Abstract Scope |
Plastic deformation of titanium is complex involving multiple slip-systems activated under different loading conditions. We propose a predictive model for the CRSS involving precise determination of dislocation core-structures and glide stresses for all the slip-systems in titanium.
The core energy of dislocation is obtained from Wigner-Seitz cell area misfit approach by faithfully representing the two-dimensional crystal structure of the slip-plane. Significant deviations from simple-sinusoidal restoring-force profile is reflected in the skewed dislocation core-structures, as dictated by the minimum energy configuration. The drastic asymmetry in the CRSS levels for forward and reverse motion of a dislocation is elucidated. The cross-slip activation of prismatic glide in Ti is analyzed, capturing the evolution of the dislocation cores and clarifying the experimentally observed non-Schmid behavior in the CRSS levels. The predictive efficacy of the approach is demonstrated by estimating the CRSS for Ti and Ti-Al binary alloys, showing excellent agreement with available experimental data. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Titanium, Computational Materials Science & Engineering |