Fretting wear refers to the damage phenomenon experienced by the mechanical compo nents undergoing micro-amplitude relative slip at their contact region due to vibration.  Titanium alloys find their extensive application in aerospace industry components such  as splines and dovetail joints, where they experience fretting wear phenomenon. This  research work investigates the effect of MoS2/Ti co-deposition coatings with varying Ti con tents, deposited on the TC4 titanium alloy substrate using magnetron sputtering. Fretting  wear tests were conducted at room temperature, 100 °C, and 200 °C, using a specially  designed fretting test fixture with a ball-on-flat contact configuration, mounted on a  servo-hydraulic fatigue testing machine. The results indicated that the coating becomes  denser with an increase in the Ti content. The coating exhibited the highest hardness and  better anti-fretting wear performance at room temperature. However, the effect of Ti  content on the fretting wear behaviors changed at elevated temperatures. At the highest  Ti content coating, excessive oxide particles were found on the worn surface at elevated  temperatures, inducing an abrasive effect and localized cracks. However, coatings with  moderate Ti content (9.62 at%) effectively protected the substrate from significant wear  at room temperature and maintained a low coefficient of friction at high temperatures  without failure. [DOI: 10.1115/1.4067042]

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