Abstract: Warming-assisted burnishing (WAB) was applied to the surface modification of Ti-6Al-4V alloys,and the characteristics of the modified surface were investigated by using scanning electron microscope,BMT.3D surface topography measurement instrument,Vickers micro-hardness tester and VHX-600E three-dimension microscope.Moreover,the tribological properties of untreated specimen，burnishing (BU)-treated specimen and WAB-treated specimen were examined by using a SRV Ⅳ tester under dry condition,respectively.The results show that (1) the surface roughness of Ti-6Al-4V alloys is significantly reduced and a thick hardening layer is generated on the alloy surface after WAB processing; (2) the friction coefficient and wear volume of WAB-treated specimen are both low- er than those of the untreated and the BU-treated specimens; (3) the wear mechanism of untreated specimen is ad- hesive wear accompanied with slight plastic deformation,while that of BU-treated and WAB-treated specimens are abrasive wear with slight fatigue spalling.It is thus concluded that WAB processing can improve the fretting wear resistance of Ti-6Al-4V alloys significantly.

Key words: burnishing, titanium alloys, fretting wear