Surface morphology of titanium alloy with monolayer microparticles under different single pulse laser energy

The surface morphology characteristics of titanium alloy under single pulse energy with local field enhancement effect were studied. The surface morphology of titanium alloy was observed by scanning electron microscope and local field enhancement theory was discussed by the FTDT simulation. The key difficulty of monolayer particles deposition was solved by production of a hydrophilic film and spin coating method. The formation mechanism of the surface morphology was discussed. Our results indicate the surface morphology is related to local field enhancement and the laser parameters including energy, size and distribution of laser spot. By using lower laser fluence than the ablation threshold of titanium alloy, laser cleaning can be obtained. When the microparticles-enhanced laser energy reaches the ablation threshold of titanium alloy surface, micropores whose size between 300 nm and 400 nm are easily obtained. The micropores distribution is related to the shape of laser spot. When the laser energy of laser spot exceeds the ablation threshold, microparticles help to control the shape of hole. The results show that particles can effectively influence the quality of laser processing, which is theory and practical significance on promoting laser processing technique in the application of particles on titanium alloy.