| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloy Behavior and Design Across Length-Scales: An SMD Symposium Honoring Easo George
|
| Presentation Title |
Deformation Twinning in HCP Ti: The Role of Interfacial Complexions and Interstitial Solutes |
| Author(s) |
Mohammad S. Hooshmand, Buyu Zhang, Enze Chen, Timofey Frolov, Ruopeng Zhang, Yan Chong, Andrew M. Minor, Mark D. Asta |
| On-Site Speaker (Planned) |
Mark D. Asta |
| Abstract Scope |
At cryogenic temperatures, hexagonal-close-packed (HCP) Ti has been observed to undergo a brittle-ductile transition when interstitial oxygen solute concentration is increased beyond a certain threshold. This observation has been linked to the a twinning mode that is not commonly observed in HCP Ti alloys. The relevant twin boundaries associated with this deformation twinning mode are observed in electron microscopy and first-principles calculations to display a novel interfacial structure (complexion) linked to a metastable polymorph in Ti. We discuss the energetic origins of this complexion and how it influences the interactions of the twin with oxygen solutes. By drawing comparisons to previous related research related to oxygen-solute interactions with more common twinning modes, we discuss mechanisms by which oxygen can alter the selection of twinning modes favorable for growth. Implications of the work for alloy design in Ti and other related materials will be discussed. |
| Proceedings Inclusion? |
Planned: |