Effects of temperature on the tribological behavior of Al0.25CoCrFeNi high-entropy alloy

The tribological behavior of Al0.25CoCrFeNi high-entropy alloy (HEA) sliding against Si3N4 ball was investigated from room temperature to 600 degrees. The microstructure of the alloys was characterized by simple FCC phase with 260 HV. Below 300 degrees, with increasing temperature, the wear rate increased due to high temperature softening. The wear rate remained stabilized above 300 degrees due to the anti-wear effect of the oxidation film on the contact interface. The dominant wear mechanism of HEA changed from abrasive wear at room temperature to delamination wear at 200 degrees, then delamination wear and oxidative wear at 300 degrees and became oxidative above 300 degrees. Moreover, the adhesive wear existed concomitantly below 300 degrees. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.