Tribological properties of AlCoCrFeNiCu high-entropy alloy in hydrogen peroxide solution and in oil lubricant

► Tribological behavior of alloys in 90% H2O2 and lubricant oil were studied. ► These two lubricants improve alloys friction and wear-resistance properties. ► The friction coefficient of pair in 90% H2O2 was lower than that in lubricant oil. ► The wear mechanism exhibited sign of inhomogeneous under these two conditions.