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AlCrTiZrMo high-entropy alloy (HEA) films with strong amorphization were obtained by co-filter cathode vacuum arc deposition, and the effect of thermal shock on the films was investigated in order to explore the protection mechanism of HEA films against mechanical components in extreme service environments. The results show that after annealing at 800 °C for 1 h, the formation of a dense ZrTiO4 composite oxide layer on the surface actively prevents the oxidation from continuing, so that the AlCrTiZrMo HEA film exhibits excellent oxidation resistance at 800 °C in air. In the friction-corrosion coupling environment, the AlCrTiZrMo HEA film annealed at 800 °C for 1 h shows the best tribocorrosion resistance due to the stable dense microstructure and excellent mechanical properties, and its ΔOCP, COF and wear rate possess the smallest values of 0.055, 0.04 and 1.34 × 10−6 mm−3·N−1·m−1. [ABSTRACT FROM AUTHOR]

Super-hard and corrosion-resistant (AlCrMoSiTi)N x high-entropy nitride coatings were prepared using a novel multi-arc cathodic vacuum magnetic filtration deposition at different N 2 gas flow rates (R N) of 0, 20, 50 and 70 sccm. The influence of R N on the element composition, phase structure, mechanical, tribological and corrosion properties of the coatings were systematically studied. Higher R N promoted higher N contents in the coatings that resulted in a transformation from an amorphous to face-centered-cubic (FCC) phase. At a high N content of 49 at. % (R N = 70%), the coating exhibits a simple FCC structure, and offers a superior combination of super-hardness, excellent wear and corrosion resistance. The exceptional hardness of the (AlCrMoSiTi)N coating (41.6 GPa) that surpasses most high-entropy ceramics is underlain by the formation of strong metal-nitride phase, the solid-solution strengthening and the fine grain strengthening. Therefore, (AlCrMoSiTi)N x nitride coating presents a potential application in protective coating owing to its extraordinary mechanical properties and corrosion resistance. • AlCrMoSiTi nitride coating prepared by multi-arc cathodic vacuum magnetic filtration. • Effect of N 2 flow rate on structure and properties of coating was studied. • AlCrMoSiTi nitride coatings show a phase structure change from amorphous to FCC. • The AlCrMoSiTi nitride coatings show a super-hard of 41.6 GPa and low wear rate. • Super-hard nitride coating has a low corrosion current density of 2.2 × 10−8 A cm−2. [ABSTRACT FROM AUTHOR]