About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Role of Aluminum Rejection from Isothermal ω Precipitates on the Formation of α Precipitates in the Metastable β-titanium Alloy Ti-10V-2Fe-3Al |
| Author(s) |
Srinivas Aditya Mantri, Sriswaroop Dasari, Abhishek Sharma, Yufeng Zheng, Hamish Fraser, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Srinivas Aditya Mantri |
| Abstract Scope |
The formation of isothermal ω phase precipitates and its influence on subsequent fine-scale α precipitation is investigated in a metastable β-titanium alloy, Ti-10V-2Fe-3Al. Atom-probe tomography and high-resolution TEM reveal that the rejection of Al, a potent α stabilizer, from the growing isothermal ω precipitates at 330°C, aids in the formation of α precipitates. Additionally, the presence of α/ω and α/β interfaces conclusively establish that these α precipitates form at the β/ω interface. Interestingly, the local Al pile-up at this interface results in a substantially higher than equilibrium Al content within the α precipitates at the early stages of formation. This can be rationalized based on a novel three-phase β+ω+α metastable equilibrium at a lower annealing temperature (330°C, below the ω solvus). Subsequent annealing at a higher temperature (600°C, above the ω solvus), dissolves the ω precipitates and reestablishes the two-phase β+α equilibrium in concurrence with solution thermodynamic predictions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Phase Transformations, Mechanical Properties |