| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dynamic Behavior of Materials X
|
| Presentation Title |
Purity Effects on Shock Driven Phase Transformations in Titanium |
| Author(s) |
David R. Jones, Jesse G Callanan, Daniel T Martinez, George T Gray, Saryu J Fensin |
| On-Site Speaker (Planned) |
David R. Jones |
| Abstract Scope |
Titanium is known to undergo a pressure-driven phase transformation from the ambient alpha phase (hexagonal close packed) to omega (simple hexagonal). There is a large scatter in the published literature for the stress required to initiate this transformation, especially under shock loading. Previous works have hypothesized that oxygen content is the dominant influence in the transition stress, and that it can block it entirely at high enough levels. Here, we study the effect of oxygen content using plate-impact shock experiments. Traditional free-surface velocity measurements are coupled with in-situ x-ray diffraction to directly measure the material phase under loading. We see that although the stress required for transformation increases with oxygen content, it still occurs. However, as the oxygen changes the equation-of-state, the phase transition signature becomes very subtle and can easily be overdriven, which without the diffraction data can lead to the conclusion of no transition occurring. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Phase Transformations, Mechanical Properties |