| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
The Relationship between Dislocation Core Structures and Oxygen Sensitivity in α-Ti |
| Author(s) |
Daryl C. Chrzan, Eric Rothchild, Max Poschmann, Siying Li, Ian Winter, Yan Chong, Ruopeng Zhang, Shiteng Zhao, Mohammad Hooshmand, David Olmsted, John W. Morris, Mark Asta, Andrew Minor |
| On-Site Speaker (Planned) |
Daryl C. Chrzan |
| Abstract Scope |
Interstitial oxygen is a potent strengthening and embrittling agent within pure Ti. Substitutional Al is also known to decrease Ti’s ductility at low O concentrations. However, when deformed at cryogenic temperatures, introduction of both impurities at relatively high concentrations increases the strength and the ductility of the alloy. Interestingly, many of these observations can be related to the ease with which dislocations will cross-slip onto alternate glide planes. Dislocation cross slip, in turn, is influenced strongly by structure of the dislocation cores. For Ti, the relevant dislocations are a-type screws, which have a tendency to spread on a number of competing slip planes. We argue that both temperature and solute interaction induced fluctuations in this spreading can account for the experimental observations, and that this understanding is key to engineering improved Ti alloys.
This work is supported by the Office of Naval Research. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Titanium, Computational Materials Science & Engineering |