| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Processing-Microstructure-Property Relationships of Titanium and Titanium Alloys
|
| Presentation Title |
Role of Oxygen on Phase Stability, Precipitation, and Deformation in Beta Titanium Alloys |
| Author(s) |
Kathleen Chou, Emmanuelle Marquis |
| On-Site Speaker (Planned) |
Kathleen Chou |
| Abstract Scope |
Titanium’s reactivity with oxygen presents significant challenges to mechanical performance, including embrittlement caused by oxygen in solid solution. Oxygen modifies the phase formation and precipitation sequences in metastable β titanium alloys, which results in novel mechanical behavior suggestive of potential new application spaces. Compositionally-graded microstructures were created using oxidation followed by ageing to understand oxygen’s influence on ω and α phase precipitation kinetics and morphologies in β Ti-Nb, Ti-15-333, and Ti-15Mo alloys. Elevated oxygen levels induced morphology, number density, and size changes for the ω phase and accelerated α nucleation rate. Notably, oxygen partitioning to ω during ageing resulted in increased resistance of ω to precipitate shearing and suppression of catastrophic failure during micropillar compression. Furthermore, oxygen-induced α refinement provides a pathway to obtain fine α laths for accelerated precipitation strengthening of β Ti alloys. These findings provide design strategies to mitigate detrimental effects from interstitial oxygen and ω precipitation. |