column:Preparation and tribological properties of textured Ti-6Al-4V alloy surface thermal oxide film

Utilizing laser processing techniques to fabricate groove-shaped microstructures on the surface of Ti-6Al-4V alloy， and an oxide film is prepared on the surface of the textured samples using thermal oxidation method. Friction and wear tests are conducted to investigate the tribological behavior of Ti-6Al-4V alloy subjected to different surface treatments under ambient dry sliding conditions. Surface morphology， cross-sectional morphology， elemental distribution， surface microhardness before wear testing， as well as microstructural and three-dimensional wear profile changes after wear testing， are analyzed using scanning electron microscopy （SEM）， energy-dispersive X-ray spectroscopy （EDS）， three-dimensional optical microscopy， and micro-Vickers hardness testing. The advantages of laser-textured combined with thermal oxidation treatments compared to single laser-textured or thermal oxidation treatment are revealed， as well as the mechanisms of wear resistance and friction reduction. The results indicate that the laser-textured combined with thermal oxidation samples exhibit more stable friction coefficients with less fluctuation compared to samples undergoing single treatments. At a normal load of 3 N， the wear rates laser-textured combined with thermal oxidation samples decrease by 66% and 68% relative to the single laser-textured and single thermal oxidation samples，respectively. As the normal load increases to 10 N， the wear rate reductions are 27% and 38%. Furthermore， the laser-textured combined with thermal oxidation samples show the disappearance of abrasive wear and a reduction in adhesive wear phenomena. They can simultaneously possess the ability to capture wear debris like a single laser-textured samples and the excellent load-carrying capacity of a single thermal oxidation samples， thereby forming multi-film protective mechanism on the substrate and effectively enhancing the tribological performance of Ti-6Al-4V alloy surfaces under dry friction conditions.