Precipitation in the equiatomic high-entropy alloy CrMnFeCoNi
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Authors
Abstract
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.
Description
Keywords
High-entropy alloys, Thermal stability, Precipitation, Metallurgy, TEM
Journal Title
Scripta Materialia
Conference Name
Journal ISSN
1359-6462
1872-8456
1872-8456
Volume Title
113
Publisher
Elsevier BV
Publisher DOI
Sponsorship
Engineering and Physical Sciences Research Council (EP/H500375/1)
Engineering and Physical Sciences Research Council (EP/M005607/1)
Engineering and Physical Sciences Research Council (EP/M005607/1)
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).