Abstract: The Ti₃₃Al₆₇N,Ti₅₀Al₅₀N and Cr₃₀Al₇₀lN hard-coatings were deposited by c-ARC⁺ cathode arc ion platting on substrate of YG8 cemented carbide.The influence of the sliding-load and Al-content on the tribological behavior against TC4 Ti-alloy and interfacial adhesion was investigated with scanning electron microscopy,energy dispersive spectroscopy and conventional mechanical tools to understand the wear mechanism(s).The preliminary results show that a combination of smearing,adhesive and oxidation wear-mechanisms produced localized peeling-off of the coatings from the substrate and that the Al-content mattered.To be specific,at a lower load,Ti₃₃Al₆₇N coating had the best wear-resistance; but at a higher load(~20 N),Cr₃₀Al₇₀lN coating exhibited the best wear-resistance.The localized film peeling-off was also tentatively discussed.