Abstract
Ti1-xAlxN coatings with face-centered cubic structure are widely used as wear-resistant protective materials. Construction of multilayer architecture is an efficient method to tailor the properties of Ti1-xAlxN coatings. In this work, the structure, mechanical and thermal properties of AlN/Ti1-xAlxN (x = 0, 0.45 and 0.62) multilayers as well as corresponding monolithic coatings are studied. Monolithic TiN, Ti0.55Al0.45N and Ti0.38Al0.62N coatings exhibit single cubic structure, corresponding to their hardness of ~26.4, 28.6 and 32.7 GPa, respectively. The epitaxial growth between AlN and TiN (Ti0.55Al0.45N) layers increases the hardness to ~30.5 and ~31.4 GPa, whereas the AlN/Ti0.38Al0.62N multilayer with incoherent interface only has a hardness of ~24.2 GPa. Even if the AlN insertion layer promotes the thermal decomposition of Ti0.55Al0.45N coating, the AlN/Ti0.55Al0.45N coating still present a higher hardness than Ti0.55Al0.45N coating during annealing up to 1000 °C. The AlN insertion layer has a positive effect on the Ti1-xAlxN coatings regardless of coherent and incoherent interfaces. Especially, the oxidation resistance of AlN/Ti1-xAlxN multilayers is predominantly influenced by the total Al content rather than the interfacial states. The AlN/Ti0.38Al0.62N multilayer with incoherent interface behaves the best oxidation resistance.
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