Mechanical and Tribological Properties of PVD-Coated Cemented Carbide as Evaluated by a New Multipass Scratch-Testing Method
Figure 4
SEM micrographs illustrating the major coating failure mechanisms in the single-pass scratch test by using a diamond stylus with radius μm. (a) Plastic deformation and minor cracking (no coating material detached), (b) chipping (cohesive failure) in combination with local interfacial spalling (adhesive failure), (c) continuous interfacial spalling (adhesive failure), and (d) continuous interfacial spalling in combination with extensive coating fragmentation at normal loads above for Ti0.34Al0.66N coating. The arrows indicate the scratching direction.
