Phase evolution in an Al0.5CrFeCoNiCu High Entropy Alloy

The phase evolution of an Al0.5CrFeCoNiCu High Entropy Alloy has been characterised following isothermal exposures between 0.1 and 1000 h at temperatures of 700, 800 and 900 °C. The NiAl based B2 phase formed extremely quickly, within 0.1 h at the higher exposure temperatures, whilst the Cr-rich σ p...

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Bibliographic Details
Published in:Intermetallics 2016-04, Vol.71, p.43-50
Main Authors: Jones, N.G., Izzo, R., Mignanelli, P.M., Christofidou, K.A., Stone, H.J.
Format: Article
Language:English
Subjects:
Electron microscopy
Heat treatment
High-Entropy Alloys
Phase transformation
Scanning
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Summary:The phase evolution of an Al0.5CrFeCoNiCu High Entropy Alloy has been characterised following isothermal exposures between 0.1 and 1000 h at temperatures of 700, 800 and 900 °C. The NiAl based B2 phase formed extremely quickly, within 0.1 h at the higher exposure temperatures, whilst the Cr-rich σ phase formed more slowly. The solvus temperatures of these two phases were found to be ∼975 and ∼875 °C respectively. Compilation of the data presented here with results previously reported in the literature enabled the production of a time-temperature-transformation diagram, which clearly indicates that the diffusion kinetics of this material cannot be considered sluggish. •Phase evolution of Al0.5CrFeCoNiCu exposed 700–900 °C for 0.1–1000 h studied.•Three different populations of Ni–Al based B2 phase observed, all form quickly.•Cr-rich sigma phase formed more slowly, adjacent to intergranular B2 precipitates.•A time-temperature-transformation diagram for Al0.5CrFeCoNiCu is plotted.
ISSN:0966-9795
DOI:10.1016/j.intermet.2015.12.001