Evaluation of Fretting Fatigue Strength in Titanium-Aluminium intermetallic

抄録

In this study, fatigue and fretting fatigue tests were conducted in TiAl intermetallic with contact pads of nickel alloy at room temperature under axial loading with stress ratio of -1. The fatigue strength was reduced by 30% due to the effect of fretting, which was less compared to other structural materials such as titanium alloys and steels. The reduction in strength was significant in high stress - low cycle region compared to low stress - high cycle region, due to more surface damage caused by high stress amplitude in low cycle region. Moreover, by increasing the contact pressure from 50 MPa to 100 MPa, fretting fatigue life was slightly reduced due to more surface damage caused by high contact pressure. Fracture surfaces and microstructure were analyzed to discuss fatigue mechanism.