Bibliographic Details
| Title: |
Design of an alumina forming coating for Nb-base refractory alloys |
| Authors: |
Collin S. Holgate, Carolina Frey, Melina A. Endsley, Akane Suzuki, Carlos G. Levi, Tresa M. Pollock |
| Source: |
Materials & Design, Vol 251, Iss , Pp 113652- (2025) |
| Publisher Information: |
Elsevier, 2025. |
| Publication Year: |
2025 |
| Collection: |
LCC:Materials of engineering and construction. Mechanics of materials |
| Subject Terms: |
Bond coat, Alumina, Refractory alloy, Oxidation, Materials of engineering and construction. Mechanics of materials, TA401-492 |
| More Details: |
Refractory multi-principal element alloys (RMPEAs) promise to significantly enhance gas turbine engine efficiency, but their poor oxidation performance inhibits their implementation. Alumina-forming bond coat alloys can provide oxidation protection, but discovering suitable chemistries remains a challenge. We employed a design methodology that screens for alumina-formation capability using Al activity and phase constitution predictions from CalPhaD (Thermo-Calc). Alloy down-selection from approximately 7,800 alloys in the Nb-Si-Ti-Al-Hf system was conducted via analysis of calculated thermodynamic properties with number-density topology style maps. This approach is validated by creating and testing the composition Nb12Si23Ti24Al36Hf5, which forms protective alumina scales up to 1400 °C and resists pesting at 800 °C. Further, the alloy has an average coefficient of thermal expansion of ∼10.1 ppm/K, making it well matched to Nb-based refractory alloys. The methodology will be useful for the design of coatings for RMPEAs, enabling their implementation and significant efficiency benefits sooner. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
0264-1275 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S0264127525000723; https://doaj.org/toc/0264-1275 |
| DOI: |
10.1016/j.matdes.2025.113652 |
| Access URL: |
https://doaj.org/article/e9613b5a8d7543e29d7d4b325abf64a0 |
| Accession Number: |
edsdoj.9613b5a8d7543e29d7d4b325abf64a0 |
| Database: |
Directory of Open Access Journals |
