| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Twin-boundary Structural Phase Transitions in Elemental Titanium |
| Author(s) |
Mohammad S Hooshmand, Ruopeng Zhang, Yan Chong, Enze Chen, Timofey Frolov, David L Olmsted, Andrew M Minor, Mark D. Asta |
| On-Site Speaker (Planned) |
Mark D. Asta |
| Abstract Scope |
Twinning in crystalline materials plays an important role in many transformation and deformation processes, where underlying mechanisms can be strongly influenced by the structural, energetic and kinetic properties of associated twin boundaries (TBs). The possibility that TBs can display multiple complexions with distinct properties, and phase transitions between them, has not been widely explored, even though such phenomena are established more generally in grain boundaries. We report experimental findings that {11-24} TBs in titanium display a thick interfacial region with crystalline structure distinct from the bulk. First-principles calculations establish that this complexion is linked to a metastable polymorph of titanium, and exhibits behavior consistent with a solid-state wetting transition with compressive strain, and a first order structural transition under tension. The findings document rich TB complexion behavior in an elemental metal, with potentially important implications for mechanical behavior and phase-transformation pathways. |
| Proceedings Inclusion? |
Planned: |