Microstructural Degradation of the AlMo0.5NbTa0.5TiZr Refractory Metal High-Entropy Superalloy at Elevated Temperatures
| Autor: | C. Neil Jones, Howard J. Stone, Tamsin Whitfield, Nick Jones |
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| Přispěvatelé: | Whitfield, Tamsin E [0000-0002-6456-4820], Stone, Howard J [0000-0002-9753-4441], Jones, Nicholas G [0000-0002-1851-2261], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Alloy Intermetallic General Physics and Astronomy lcsh:Astrophysics 02 engineering and technology engineering.material 01 natural sciences Article thermodynamics phase transformation/precipitation 0103 physical sciences lcsh:QB460-466 intermetallics lcsh:Science Nanoscopic scale 010302 applied physics Precipitation (chemistry) Metallurgy Refractory metals 021001 nanoscience & nanotechnology Microstructure refractory metal high entropy alloys lcsh:QC1-999 Superalloy engineering Degradation (geology) lcsh:Q 0210 nano-technology lcsh:Physics |
| Zdroj: | Entropy, Vol 23, Iss 80, p 80 (2021) Entropy Volume 23 Issue 1 |
| ISSN: | 1099-4300 |
| Popis: | Refractory metal high-entropy superalloys (RSA), which possess a nanoscale microstructure of B2 and bcc phases, have been developed to offer high temperature capabilities beyond conventional Ni-based alloys. Despite showing a number of excellent attributes, to date there has been little consideration of their microstructural stability, which is an essential feature of any material employed in high temperature service. Here, the stability of the exemplar RSA AlMo0.5NbTa0.5TiZr is studied following 1000 h exposures at 1200, 1000 and 800 ° C. Crucially, the initial nanoscale cuboidal B2 + bcc microstructure was found to be unstable following the thermal exposures. Extensive intragranular precipitation of a hexagonal Al-Zr-rich intermetallic occurred at all temperatures and, where present, the bcc and B2 phases had coarsened and changed morphology. This microstructural evolution will concomitantly change both the mechanical and environmental properties and is likely to be detrimental to the in-service performance of the alloy. |
| Databáze: | OpenAIRE |
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