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A comprehensive literature review on recently rediscovered Co- and/orCoNi-based superalloys, strengthened by the {\gamma}' phase, revealed arelationship between the configurational entropy of the system and the{\gamma}' solvus temperature. This study was conducted on a high Cr CoNi-basedsuperalloy system with high configurational entropy to test our hypothesisbased on the sustainable metallurgy framework. Thermodynamic calculations wereperformed to design the chemical compositions, followed by vacuum casting andheat treatments to produce the desired alloys. The microstructures werecharacterized using a scanning electron microscope, electron backscattereddiffraction, transmission electron microscope, and differential thermalanalysis. Microhardness and nanoindentation tests were employed to measure themechanical properties. The results showed that both the configurational entropyand the type of alloying elements determine the final high-temperatureperformance of the alloys. We found that to enhance the higher {\gamma}' solvustemperature, the configurational entropy should be increased by adding{\gamma}' stabilizing elements. The microstructural and mechanicalcharacteristics of the designed alloys before and after heat treatments arediscussed in detail. The outcome of this study is beneficial for developingcobalt-based high-entropy superalloys with appropriate processing windows andfreezing ranges for advanced sustainable manufacturing purposes, such as usingpowder bed fusion technologies.

Exploring the Impact of Configurational Entropy on the Design and Development of CoNi-Based Superalloys for Sustainable Applications