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Cu 45 Mn 25 Al 15 Fe 5 Cr 5 Ni 5 high entropy alloy was prepared using casting route. Detailed microstructural analysis revealed the formation of dendritic structure in the as-cast sample. The results showed that the dendrite (DR) regions are riched with Cu and Mn, while the inter-dendrite (ID) regions are riched with Cr and Fe. Metallographic investigation was conducted using optical microscope and scanning electron microscope as well. Determination of phase analysis was carried out using x-ray diffraction. Corrosion properties were studied via Auto LAB PGSTAT 302N, supplied with Nova software. The investigated alloy demonstrates superior corrosion resistance with average corrosion rate 0.056 mm year −1 .

The influence of Cr or Ti additions to Cu40Mn25Al20Fe5Ni5 high entropy alloy (HEA) on the microstructure and corrosion behavior in different concentrations of HNO3 solution were investigated. The microstructures of the Cu-rich HEAs are characterized and analyzed. Microstructural analysis of the HEAs indicates the formation of a dendritic structure. Also, the phases are identified by using X-ray diffraction (XRD). The corrosion behavior of the investigated HEAs in the HNO3 solution was studied. The corrosion rate (CR) for Cu40Mn25Al20Fe5Ni5Ti5 HEA (Ti5 HEA) has a lower value than Cu40Mn25Al20Fe5Ni5Cr5 HEA (Cr5 HEA). The morphology of the corroded HEAs was investigated by using SEM images, EDX analysis, and mapping for elemental distribution. Cr addition led to the formation of a Cr2O3 protective film on the dendrites. However, the Ti5 HEA has a good surface morphology with a homogenous distribution than Cr5 HEA which is associated with a decrease in the corrosion rate.

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