About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Refractory Metals 2025
|
Presentation Title |
High-Temperature Oxidation Behavior of Novel Refractory Complex Concentrated Alloys |
Author(s) |
Krishna Prasad Joshi, Arturo Herrera, Pankaj Kumar |
On-Site Speaker (Planned) |
Krishna Prasad Joshi |
Abstract Scope |
Refractory complex concentrated alloys (RCCAs) exhibit excellent potential for high-temperature applications, considering the high-temperature strength and thermal stability. Nb-based C103 (Nb-10Hf-1Ti) alloy is widely used in high-temperature applications but requires costly oxidation-resistant coatings due to its poor inherent oxidation resistance. Despite tremendous efforts, no niobium-based alloy has been developed that forms the protective oxide scale. In this presentation, the high-temperature oxidation behavior of new RCCAs with compositions Nb32.5Ta32.5Mo7.5W7.5V10Ti10 and Nb30.55Ta30.55Mo7.05W7.05V9.4Ti9.4Cr6 were examined at 1000⁰C for 0.5hr, 5hr and 10hr comparing them to C103. Visible oxidation changes were observed at ~500°C for C103 and ~750°C for RCCAs. At 1000°C, a linear increase in weight is observed in C103 with oxidation time, indicating the formation of a porous oxidation layer, while in RCCAs a parabolic increase in weight is observed. Although the oxidation rate decreases with time at 1000⁰C for both the RCCAs, Cr containing RCCA shows the lowest oxidation rate. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, High-Temperature Materials, Powder Materials |