About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Quantitative Criteria for Deformation Modes Selection in Metastable Beta-Titanium Alloys |
| Author(s) |
Ganlin Chen, Deepak Vikraman Pillai, Yufeng Zheng, Liang Qi |
| On-Site Speaker (Planned) |
Ganlin Chen |
| Abstract Scope |
Metastable body-centered cubic (BCC) titanium alloys exhibit diverse deformation modes that critically influence their plastic response, offering opportunities to tailor strength and ductility. However, the mechanisms governing deformation mode selection remain poorly understood due to the complex energy landscape involving diffusionless phase transformations and concurrent plastic deformation. In this work, we use atomistic simulations to investigate the nucleation behavior of various deformation modes (martensite, {112} twin, {332} twin and dislocation) at the atomic scale. Structural analysis reveals the interplay between phase transformations and competing defects, highlighting the importance of misfit strain energy in dictating twinning mode competition. To quantitatively assess different defects nucleation conditions, we construct a two-dimensional defect diagram that incorporates both misfit strain energy and chemical free energy. This framework provides mechanistic insight into deformation mode selection and establishes design principles for developing new Ti alloys with tunable mechanical properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Phase Transformations, Modeling and Simulation |