ABSTRACT
Existing metals and alloys are susceptible to working conditions at high temperatures, causing rapid oxidation resulting in the reduction of mechanical strength. While nickel-based superalloys and a variety of steels are extensively used for high temperature applications in the different industries, these materials still suffer from the limitations of temperature, pressure, and environmental conditions. A novel set of materials known as high entropy alloys (HEAs) or multicomponent equimolar or near-equimolar alloys has emerged as potential materials for providing several solutions in various fields. The AlCr1.5CuNi2FeCox (where x = 0, 0.25, 0.5, 0.75, and 1 in moles) high entropy alloys were successfully cast by high-temperature vacuum induction furnace in a controlled environment. The addition of cobalt improves the corrosion resistance of HEAs at room temperature in a 3.5 wt.% sodium chloride (NaCl) solution. The formation of the protective layer and the body-centered cubic (BCC) structure of the system results in the improvement in the corrosion resistance. The thermal conductivity of the alloys decreases with the increase in the cobalt content and increases with the increase in the temperature.
