Effect of Cr on the Corrosion and Localized Mechanical Properties of AlMoNbTi High Entropy Alloy

This work evaluates the corrosion protection efficiency of AlMoNbTi and CrAlMoNbTi high entropy alloys in 3.5 wt% of NaCl solution at room temperature. Electrochemical impedance spectroscopy test by Gamry instruments was used in this evaluation. The results indicate that adding Cr in an equal molar ratio with AlMoNbTi increases the corrosion protection efficiency by 2.5 times. Additionally, the microstructural analysis by scanning electron microscopy reflects the heterogeneity in the microstructures of AlMoNbTi and CrAlMoNbTi. So, nanoindentation tests are performed to find the localized mechanical properties: hardness and elastic modulus, at different positions for these specimens. However, there is no significant difference in hardness and elastic modulus was found between these two alloys. The hardness mapping, microstructures, and X-ray diffraction data indicate that all three specimens have at least two phases in their microstructures. Both specimens’ experimental results are compared with conventional carbon steel alloy C1060 for better understanding the performance of these two alloys.