| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
High-temperature Oxidation Behavior of Refractory Complex Concentrated Alloys in Ta-Nb-Cr-Ti-Al system |
| Author(s) |
Willian Martins Pasini, Filip Baciak, Aleksandra Bętkowska , Piotr Kupczyk, Dorota Wilk-Kołodziejczyk, Filip Kateusz, Wojciech Polkowski |
| On-Site Speaker (Planned) |
Willian Martins Pasini |
| Abstract Scope |
Refractory Complex Concentrated Alloys (RCCAs) are promising structural candidates to surpass Ni superalloys in high-temperature environments. However, the oxidation resistance of refractory metal-based alloys represents one of their major drawbacks. Recently, a novel approach to providing inherent protection for RCCA was proposed based on the alloying of Ta and Cr to produce CrTaO4 on a Ta-Mo-Cr-Ti-Al system. Nevertheless, substantial Cr and Ta additions cause the precipitation of the brittle intermetallic Laves phase. Through the calculation of semi-empirical parameters and Calphad calculations, this work explores and designs new compositions of RCCAs with varied ratios of Ta and Cr, attempting to control the Laves phase formation. Prediction and validation of oxidation behavior were performed by artificial neural network models and 24 h long TGA tests at 1300°C in synthetic air (80/20 N2/O2 by volume) to reveal initial oxidation kinetics and short-term high-temperature degradation performance of news RCCA alloys. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |