Transport Properties of Equiatomic CoCrFeNi High-Entropy Alloy with a Single-Phase Face-Centered Cubic Structure

Transport Properties of Equiatomic CoCrFeNi High-Entropy Alloy with a Single-Phase Face-Centered Cubic Structure

The key thermophysical properties necessary for the successful design and use of CoCrFeNi alloy in thermophysical applications have been measured experimentally, and the results have been compared with literature values and results previously obtained for commercial Ni-Cr alloys and equiatomic CoCrF...

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Bibliographic Details
Published in:Crystals (Basel) Vol. 13; no. 11; p. 1567
Main Authors: Bykov, Victor A., Kulikova, Tatyana V., Sipatov, Ivan S., Sterkhov, Eugene V., Kovalenko, Darya A., Ryltsev, Roman E.
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-11-2023
Subjects:
Alloys
Annealing
CoCrFeNi alloy
differential scanning calorimetry
Diffusivity
dilatometry
Electric arc melting
Electric properties
Heat conductivity
Heat transfer
High entropy alloys
Homogenization
Investigations
Lasers
Nickel chromium alloys
Physical properties
short-range ordering
Solid solutions
Solidification
Specialty metals industry
Specific heat
specific heat capacity
Temperature
Temperature dependence
Thermal conductivity
Thermal diffusivity
Thermal expansion
Thermal properties
Thermophysical properties
Transport properties
Germany
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Summary:The key thermophysical properties necessary for the successful design and use of CoCrFeNi alloy in thermophysical applications have been measured experimentally, and the results have been compared with literature values and results previously obtained for commercial Ni-Cr alloys and equiatomic CoCrFeNi alloy. In particular, the thermal diffusivity, coefficient of thermal expansion (CTE), and specific heat capacity were measured for the as-cast and homogenized equiatomic CoCrFeNi alloy over a temperature range allowing the thermal conductivity to be calculated up to 1173 K. The thermal conductivity and thermal diffusivity of the equiatomic CoCrFeNi alloy were found to deviate from monotonic behavior in the temperature range from 773 to 1100 K. Such a deviation was previously observed in the behavior of the temperature dependence of CTE and specific heat capacity of the equiatomic CoCrFeNi alloy. The non-linear behavior is primarily the result of order/disorder phenomena for the as-cast and homogenized sample, as well as non-equilibrium solidification under arc melting conditions for the as-cast sample. The measured data of thermophysical properties are provided for thermally differently treated samples, and it is shown that there is a difference in the behavior of the temperature dependences of CTE, thermal diffusivity, and heat capacity.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst13111567