Precipitation in the Equiatomic High-Entropy Alloy CrMnFeCoNi
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Pickering, E., Muñoz-Moreno, R., Stone, H., & Jones, N. (2015). Precipitation in the Equiatomic High-Entropy Alloy CrMnFeCoNi. Scripta Materialia, 113 106-109. https://doi.org/10.1016/j.scriptamat.2015.10.025
CrMnFeCoNi is widely considered to be an exemplar high-entropy alloy, which is stable as a single solid-solution phase at all temperatures below its melting point. Here, for the first time, the formation of two distinct types of Cr-rich precipitate in coarse-grained CrMnFeCoNi is reported following prolonged exposures at 700 °C. The precipitates were identified as M23C6 and the σ phase, and their formation in unworked material during heat treatments without an applied stress indicated that they are equilibrium phases. Therefore, CrMnFeCoNi can no longer be regarded as thermodynamically stable as a single phase at all temperatures below its solidus.
High-entropy alloys, Thermal Stability, Precipitation, Metallurgy, TEM
The authors would like to thank K. Roberts and S. Rhodes for their assistance, and A.S. Wilson for helpful discussions. The authors acknowledge funding from the Rolls-Royce/EPSRC Strategic Partnership (EP/M005607/1).
External DOI: https://doi.org/10.1016/j.scriptamat.2015.10.025
This record's URL: https://www.repository.cam.ac.uk/handle/1810/251467
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Licence URL: http://creativecommons.org/licenses/by/4.0/
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