Anisotropic deformation and fracture mechanisms of physical vapor deposited TiN/ZrN multilayers

Yang, Lingwei; Chen, Yunsheng; Chen, Jiao; Wang, C.; He, Guangyu

doi:10.1016/j.ceramint.2020.03.095

Cited by 12 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existence of many interfaces in the multilayers hinders the dislocation movement, as they act as storage sites for the defects [38], and thus facilitate the high hardness. Moreover, the crack propagation direction is changed at the interface [39,40], causing the toughness improvement. Among the wide variety of reported multilayers, coatings with a nanocomposite TiAlSiN sublayer of the period are rather limited [41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

The Role of Period Modulation on the Structure, Composition and Mechanical Properties of Nanocomposite Multilayer TiAlSiN/AlSiN Coatings

Kolchev,

Kolaklieva,

Chitanov

et al. 2023

Coatings

View full text Add to dashboard Cite

This paper presents the results of the investigation of a multilayer TiAlSiN/AlSiN coating. A novel coating architecture with a period consisting of nanocomposite sublayers of TiAlSiN and AlSiN was developed. We discovered that the combination of a harder sublayer with a more elastic one allows for obtaining a suitable combination of superhardness and enhanced toughness. The coating was deposited by cathodic arc technology. The EDS, XRD, and XRS analyses revealed that the nanocomposite structure is composed of TiAlSiN and AlSiN nanocrystallites, with sizes of 12–13 nm and 4–5 nm, respectively. The nanograin phase is incorporated in an amorphous Si3N4 matrix. The achieved structure causes the presence of four factors contributing to the hardness increase: nanocomposition, solid solution, refinement hardening, and the formation of many interfaces. An instrumented indentation test was used to investigate the mechanical properties. The developed coating possesses a superhardness of 49.5 GPa and a low elastic modulus of 430 GPa, resulting in an improved elastic strain resistance of 0.11, a plastic deformation resistance of 0.58 GPa, and an elastic recovery of 68%. These results imply that the developed coating combines high stability with mechanical degradation under external influence and provides an improved ability to absorb energy at deformation before fracture, and high elastic recovery. The investigation of the effect of the period modulation on the structure, composition, and mechanical properties of the nanocomposite multilayer TiAlSiN/AlSiN coating showed that the superhardness was due to the nanocomposite and solid solution hardening rather than the increased number of interfaces. The demonstrated combination of superhardness with high elasticity and improved toughness determines the developed nanocomposite TiAlSiN/AlSiN coating as very suitable for industrial applications such as high speed and dry machining.

show abstract