The fretting wear behavior of TB6 titanium alloy before and after laser shock peening (LSP) was studied. The influence of displacement amplitude on friction coefficient and wear mechanism was analyzed. The surface integrity

friction morphology and wear volume of the original sample and the sample after LSP treatment were analyzed by X–ray diffraction

microhardness

laser confocal microscopy and scanning electron microscopy. The results show that after LSP treatment

the surface roughness (Ra) of TB6 increases from 0.203μm to 0.321μm. The surface microhardness increases from 322HV to 400HV. The residual compressive stress layer is introduced into the surface layer

and the maximum residual stress reaches –650MPa. In the fretting friction process

when the displacement amplitude is small (≤50μm)

the adhesion appears on the friction surface of the sample

and the adhesion degree and friction coefficient increase after LSP. When the displacement amplitude is larger (≥75μm)

pits appear on the friction surface of the sample. After LSP

the slope of the pits decreases

the friction coefficient and wear volume decrease

and the fatigue wear and abrasive wear are alleviated

which is helpful to improve the wear resistance of the material.