Abstract
To enhance the fretting wear resistance of Ti60 titanium alloy, a YAG coating was applied to the surface using the APS (atmospheric plasma spray) process, followed by an investigation of its fretting wear performance. Nanoindentation technology was employed to evaluate nanomechanical properties, and subsequently, techniques including SEM, EDS, TEM, XRD, XPS, and laser confocal microscopy were utilized to characterize microstructural features of the wear marks and the composition of wear debris. The results indicated that, owing to the presence of the APS YAG coating, the surface nanohardness of the Ti60 titanium alloy increased from 4.4 GPa to 11.06 GPa, while the fretting friction coefficient decreased from 0.186 to 0.155, and the volume wear is reduced by 80.53 %, which significantly improves the fretting wear resistance of Ti60 titanium alloy. As the number of fretting cycles increased, a complete friction layer formed on the surface of the Ti60 titanium alloy, leading to a decrease in fretting friction coefficient and a shift in the wear mechanism. Ultimately, a mixed mechanism was observed involving oxidative wear, abrasive wear, fatigue-induced peeling of the friction layer, and localized plastic deformation. Conversely, the fretting wear mechanism of the APS YAG coating consistently demonstrated abrasive wear, adhesive wear, and fatigue-induced cracking and spalling of the coating.
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