Abstract
The influence of laser fluences and laser scanning speeds on the morphologies and wetting properties of titanium alloy surfaces was investigated by fs laser line scanning. The fs laser textured surfaces showed some micro-cracks, and laser-induced periodic surface structures (LIPSS) with some nanoparticles decoration. The water wetting response of the samples were measured by static contact angle measurements. The obtained laser-textured titanium alloy surfaces were hydrophilic, and the water contact angle (CA) decreased with increase of the laser fluence used and also the surface roughness. The laser-textured surfaces with laser fluence of 0.79 J/cm2 and scan speed of 50 mm/min were found to retain its hydrophilic charateristic for a long time storage in ambient atmosphere. However, some other laser-textured surfaces were changed from hydrophilic to hydrophobic range. The micro-Raman spectra were also used to analyze the surface phases of titanium alloy after laser treatments. The results imply the potential applications of these surfaces in a variety of fields.
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