Abstract
Al0.68Cr0.32N, Al0.66Cr0.25Ti0.09N and Al0.62Cr0.20Ti0.18N coatings prepared by cathodic arc evaporation exhibit single phase cubic structure. Increasing Ti content from 0 to 18 at% causes a continuous hardness promotion from ∼27.4 to 33.2 GPa, however, a drop in elastic modulus from ∼481.8 to 337.1 GPa. Annealing of Al–Cr–N in Ar results in a transition into stable phases of wurtzite (w-) AlN and Cr via an intermediate phase Cr2N. Alloying with Ti into Al–Cr–N promotes the w-AlN formation, but retards the N-loss, where the finally stable phases of w-AlN, Cr and TiN after annealing are obtained. Nevertheless, the Ti-addition has a significantly inferior effect on the oxidation resistance of Al–Cr–N coating due to the higher affinity between Ti and oxygen, where the Al0.68Cr0.32N and Al0.62Cr0.20Ti0.18N coatings after oxidation at 1100 °C for 20 h reveal oxide scales of ∼1.3 and 4.0 μm, respectively.
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