Abstract
In this study, we deposited CrNx/CrAlN multilayer coatings with different modulation periods on TC4 titanium alloy substrates via cathodic arc deposition. The effects of the different modulation periods on the microstructure, mechanical properties, erosion resistance, and fracture failure mechanism of the coatings were studied. The results show that the multilayer coatings exhibit a dense structure, with the CrNx layer being mainly composed of the CrN (200) and Cr2N (111) phases and the CrAlN layer being mainly composed of the CrN (111) and CrN (200) phases. The comprehensive mechanical properties of the multilayer coating with a modulation period of 200 nm are the best: The hardness is 3306 HV, the bonding force is 50.0 N, the crack propagation resistance is 483, the residual stress is the smallest, and the erosion resistance is the best. In the process of coating fracture failure, the CrAlN hard layer is mainly wear-resistant, while the CrNx metal-rich ductile layer mainly absorbs the fracture stress and undergoes a ductile–brittle transition, which eventually results in brittle fracture and layered peeling failure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
