Abstract
The presence of a refractory metal such as niobium in high- entropy alloys improves their hardness values, wear and corrosion resistance. Herein, a CrCoNiCuNbx alloy-system used as coating was developed by directed energy deposition technique, and the effect of niobium variation on microstructural and phase evolution, hardness, wear characteristics and corrosion resistance were studied in comparison to the base alloy (CrCoNiCu) and steel baseplate. In addition, structure-property correlations were conducted, and it was observed that the variation of niobium resulted in phase and microstructural evolutions of the alloy- system. These directly influenced the hardness, wear and corrosion resistance of coatings as it resulted in a 62.47% improvement in hardness at 0.50 niobium content and a more than 260-fold increase in corrosion resistance in 3.5% NaCl electrolyte at 0.25 niobium compared to the mild steel substrate. The wear resistance at 10 and 15 N applied loads for the coating with 0.75 niobium content were also found to be enhanced by about 93.94% and 80.83%, respectively, when compared to those of steel substrate.
Published Version
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