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Meeting

2026 TMS Annual Meeting & Exhibition

Symposium

Computational Thermodynamics and Kinetics

Presentation Title

The Role of {101 ̅2} Tension and {112 ̅2} Compression Twins on the Alpha to Omega Phase Transformation in Ti

Author(s)

Khanh Dang, Laurent Capolungo

On-Site Speaker (Planned)

Khanh Dang

Abstract Scope

The plastic deformation of Ti is mediated by multiple deformation modes such as dislocation slip, twinning, and phase transformation (PT). Yet, the role of preexisting twin networks on the PT from hexagonal close packed α Ti to ω hexagonal Ti remains relatively unexplored. In this work, we study the effects of preexisting twins on this PT from both thermodynamics and kinetics standpoints. We utilize an isotropically linear elasticity micromechanical model alongside MD simulations to determine the effects of preexisting twins on the stability of ω nucleus. We found from a thermodynamic standpoint, both preexisting {101 ̅2} tension and {112 ̅2} compression twins promote nucleation of ω nucleus within the twin, with the former having a greater effect. Furthermore, MD simulations reveal that the growth of the ω nucleus is stopped by the {112 ̅2} CTB but not the {101 ̅2} CTB; thereby showing the role of short-range pinning of boundaries.

Proceedings Inclusion?

Planned:

Keywords

Computational Materials Science & Engineering, Mechanical Properties, Phase Transformations

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