Abstract
Ti-6Al-4V alloy is the main structure material of aerospace components due to its excellent corrosion resistance, high specific strength and other good characteristics. However, this alloy has low hardness, poor wear resistance and higher friction coefficient, so it is very sensitive to fretting wear (FW) and fretting fatigue (FF) damages. In this work, we studied three kinds of soft inter-layers (copper foil, nickel foil and polytetrafluoroethylene (PTFE) lamella) between the Ti-6Al-4V fatigue samples and the Ti-6Al-4V counterparts respectively to enhance the FF and FW resistance of this alloy. The results show that the method is an economical and effective way to increase the FF and FW resistance of Ti-6Al-4V alloy. The order of enhancement in the FF resistance of the titanium alloy was copper foil > PTFE lamella > nickel foil. Additionally, the friction coefficients of PTFE lamella, copper foil, nickel foil and Ti-6Al-4V alloy were about 0.10, 0.60, 0.65 and 1.1, respectively. The lowest friction coefficient of PTFE, compared with copper foil, nickel foil and substrate, was of great benefit to improving the FF property of Ti-6Al-4V alloy. Nevertheless, the FF life of Ti-6Al-4V alloy with the copper interlayer was higher than PTFE, which was about 5 times higher than substrate.
Highlights
The Ti-6Al-4V alloy is widely used in aerospace field due to their high strength/weight ratio, corrosion resistance, thermal stability properties, and other excellent comprehensive performance
The friction coefficient of copper foil and nickel foil contacted with titanium alloy was approximate, and lower than titanium alloy
The fretting wear resistance of titanium alloy could be enhanced via copper foil and nickel foil, which was ascribed to the two interlayers reduced the adhesive and abrasive wear damage of Ti-6Al-4V alloy
Summary
The Ti-6Al-4V alloy is widely used in aerospace field due to their high strength/weight ratio, corrosion resistance, thermal stability properties, and other excellent comprehensive performance. The Cu/Ni film could significantly improve the fretting wear and fretting fatigue resistance of Ti-811 at room temperature because its excellent comprehensive properties with well toughness, high strength and good lubrication action. The soft foils of copper, nickel and PTFE with well lubrication were helpfully to reduce the friction coefficient of fretting wear on titanium alloy surface. Compared with IAD technique, the copper foil, nickel foil and PTFE lamella are more economical to resistant the fretting damage of titanium alloy at room temperature. Some fretting wear and fretting fatigue tests have been performed in order to clarify the role of those inter-layers during the fretting damage processes of titanium alloy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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
