The influence of the Nb:Ta ratio on the microstructural evolution in refractory metal superalloy systems

Refractory metal superalloys have the potential to facilitate a significant increase in gas turbine operating temperatures that would enhance efficiency and reduce emissions. However, fulfilling this potential requires a much more detailed understanding of the underlying metallurgy and how it is inf...

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Veröffentlicht in:Applied physics letters 2021-11, Vol.119 (21)
Hauptverfasser: Whitfield, T. E., Wise, G. J., Stone, H. J., Jones, N. G.
Format: Artikel
Sprache:eng
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Zusammenfassung:Refractory metal superalloys have the potential to facilitate a significant increase in gas turbine operating temperatures that would enhance efficiency and reduce emissions. However, fulfilling this potential requires a much more detailed understanding of the underlying metallurgy and how it is influenced by alloying additions. Here, the influence of systematically varying the Nb:Ta ratio in a series of Ti–Zr–Nb–Ta alloys has been studied and compared to thermodynamic predictions. The experimental results show that higher Nb:Ta ratios suppress phase separation but lower the inter-phase misfit. As such, optimizing these alloys for specific applications will require careful balancing of these effects.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0068045