Effects of Al on the Phase Volume Fractions and Wear Properties in the AlxCoCrFeMoNi High Entropy Alloy System

A detailed investigation was carried out to study the effect of Al on the phase volume fractions and wear properties in the Al x CoCrFeMoNi high entropy alloy (HEA) system. The analysis of phases was studied by X-ray diffraction for further Rietveld refinement was performed to determine the volume fraction of phases. In order to accomplish experimental studies, the volume fraction of phases has been analyzed by CALPHAD based simulations. The wear behavior of HEAs were studied under dry sliding conditions using a ball-on-disc geometry. The alloy system includes FCC, σ, B2 and BCC phases and exhibits a broad range of phase transformations with varying Al content. The wear behavior of HEAs, in the present work, is correlated with their volume fraction of phases and hardnesses. The minimum wear rate, 3.04 × 10 −5 mm 3 /(Nm), is observed in A 1.5 CoCrFeMoNi alloy containing relatively hard σ, B2 and BCC phases, which has a maximum hardness 829.8 HV. Graphical Abstract