| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
The Role of Non-hydrostatic Stress State in the α to ω Phase Transformation in Ti |
| Author(s) |
Khanh Dang, Laurent Capolungo, Carlos N Tome |
| On-Site Speaker (Planned) |
Khanh Dang |
| Abstract Scope |
While the crystallography and orientation relationships of the pressure-induced martensitic α to ω transformation in Ti have been well-documented, the transformation mechanism and governing parameters are not fully understood. For instance, the transition pressure at room temperature exhibits a great discrepancy, varying from 0.25 to 7.0 GPa, which could be due to (1) impurities and defects or (2) non-hydrostatic stress effects. Here, MD and DDD simulations are utilized to explore the role of the non-hydrostatic stress states in the α to ω phase transformation in Ti. First, a spherical ω nucleus within a α domain is generated and subjected to different loading conditions to determine the effects of non-hydrostatic stress states on the stability of the ω nucleus. Second, the sources of non-hydrostatic stress states are determined by studying the effect of defects such as prismatic dislocation loops and {101$2}〈1$011〉 twins on the stability of the ω nucleus. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Phase Transformations, Titanium |