| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Enhanced Work-hardening from Oxygen-stabilized Omega Precipitation in Aged Metastable Beta Ti Alloys |
| Author(s) |
Kathleen Chou, Emmanuelle Marquis |
| On-Site Speaker (Planned) |
Kathleen Chou |
| Abstract Scope |
Omega phase formation in metastable beta titanium alloys is known to cause significant ductility loss and embrittlement. Omega precipitates, which form rapidly during quenching and low temperature ageing, are therefore typically avoided in final microstructures after heat treatment. However, our recent work has shown that elevated levels of interstitial oxygen in Ti-Nb based alloys increases the work hardening capability during compression of these alloys with isothermal omega phase formation. In this work, commercial alloys Ti-15Mo and Ti-15-3-3-3 were investigated to understand omega formation with interstitial oxygen obtained through an oxidation exposure prior to ageing. The subsequent effect of omega precipitates with oxygen on mechanical properties was assessed using micropillar compression testing. Ageing treatments were selected to promote rapid isothermal omega precipitation and fast elemental partitioning. The results from this work may mitigate omega’s known detrimental effects on mechanical properties and enable new heat treatment design strategies for beta titanium alloys. |
| Proceedings Inclusion? |
Planned: |