| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
The Oxidation Behavior of Near α-Ti Alloy-γ-TiAl Composites Processed via Powder Metallurgy Routes |
| Author(s) |
Jishnu Bhattacharyya, YunJo Ro, William P. Moffat, Sean R. Agnew, Haydn N. G. Wadley |
| On-Site Speaker (Planned) |
Jishnu Bhattacharyya |
| Abstract Scope |
The oxidation behavior of composites comprising of near α-Ti alloy Ti6242 and γ aluminide-based Ti4822, fabricated via powder metallurgy route, is investigated. Oxidation tests are carried out in air between 550-850 °C. Five compositions (0, 10, 50, 90, and 100 wt.% Ti4822) are chosen for the present work. Monolithic Ti6242 alloy and Ti4822 alloy show significant mass gain during oxidation at (and beyond) 600°C and 750°C, respectively. Addition of 10wt.% Ti4822 to Ti6242 reduces the mass gain by ~25% as compared to monolithic Ti6242, thereby improving the oxidation resistance. Interestingly, the 90wt.% Ti4822 composite exhibits very similar oxidation behavior as monolithic Ti4822. The role of interdiffusion between the base alloys leading to multiphase microstructures (α, β/β0, α2-Ti3Al, and γ-TiAl) is investigated as they have very different oxygen diffusivities and solubility. The composition and microstructure of the oxide scale and the oxygen affected zone are examined to explain the observations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Environmental Effects, Other |