Microstructure and Thermal Analysis of Metastable Intermetallic Phases in High-Entropy Alloy CoCrFeMo0.85Ni |
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| Authors: | Zihui Dong Dmitry Sergeev Michael F Dodge Francesco Fanicchia Michael Müller Shiladitya Paul Hongbiao Dong |
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| Institution: | 1.School of Engineering, University of Leicester, Leicester LE1 7RH, UK; (Z.D.); (M.F.D.); (S.P.);2.Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-2), Leo-Brandt-Strasse 1, 52425 Jülich, Germany; (D.S.); (M.M.);3.TWI Ltd, Granta Park, Great Abington, Cambridge CB21 6AL, UK; |
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| Abstract: | CoCrFeMoNi high entropy alloys (HEAs) exhibit several promising characteristics for potential applications of high temperature coating. In this study, metastable intermetallic phases and their thermal stability of high-entropy alloy CoCrFeMo0.85Ni were investigated via thermal and microstructural analyses. Solidus and liquidus temperatures of CoCrFeMo0.85Ni were determined by differential thermal analysis as 1323 °C and 1331 °C, respectively. Phase transitions also occur at 800 °C and 1212 °C during heating. Microstructure of alloy exhibits a single-phase face-centred cubic (FCC) matrix embedded with the mixture of (Co, Cr, Fe)-rich tetragonal phase and Mo-rich rhombohedron-like phase. The morphologies of two intermetallics show matrix-based tetragonal phases bordered by Mo-rich rhombohedral precipitates around their perimeter. The experimental results presented in our paper provide key information on the microstructure and thermal stability of our alloy, which will assist in the development of similar thermal spray HEA coatings. |
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| Keywords: | high-entropy alloy thermodynamics microstructure phase evolution |
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