| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection II
|
| Presentation Title |
Oxidation Behavior of TiAl Alloys and its Optimization by Deposition of Al-rich Coatings via Pack Aluminizing |
| Author(s) |
Lukas Mengis, Anke Silvia Ulrich, Alexander Donchev, Mathias Christian Galetz |
| On-Site Speaker (Planned) |
Lukas Mengis |
| Abstract Scope |
Titanium aluminides are excellent light-weight materials for high-temperature applications, among others, because of their superb specific high-temperature strength. However, their application above 750°C is restricted by their insufficient oxidation resistance. In this regard, oxidation does not only lead to the formation of an unprotective mixed oxide scale but further aggravates the inherent brittleness of these intermetallics. This study undertakes a comparative investigation of the oxidation behavior of the TiAl alloys GE 48-2-2 and TNM-B1 at 600-900 °C for up to 1000 h in air. Emphasis is placed on the occurring oxidation mechanisms as well as related microstructural changes. A coating concept based on pack aluminizing is presented aiming to minimize the oxidation-induced embrittlement of the investigated alloys. Comparing four-point-bending tests as well as nanoindentation measurements of the coated and uncoated samples have been performed after exposure in air in order to verify the enhanced resistance against the embrittlement. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |