INVESTIGATION SURFACE MORPHOLOGY OF CP TI AND TI6AL4V ALLOY TREATED WITH PICOSECONDLASER
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- TITLE: INVESTIGATION SURFACE MORPHOLOGY OF CP TI AND TI6AL4V ALLOY TREATED WITH PICOSECONDLASER
- ABSTRACT: The aim of the present paper is to investigate the morphology of titanium surfaces treated with picosecond laser. Round samples of cpTi Gr-2 and Ti6Al4V alloy were treated by a commercial picosecond laser. Two variables were used: average power (1W, 0.5W, 0.2W) and pulse number (1,000-20,000). The samples were investigated by OM, SEM, EDX and non-contact 3D surface profilometer. It was found that the topography of the laser-treated surfaces of both cpTi Gr-2 and Ti6Al4V alloy was similar. It is characterized with micron-scale periodical structures in radial direction, appearance of cavities, submicron-scale periodical structures in the former grains along the periphery of ablated craters (in low energy regimes) and splashed material and debris along the boundaries of the cavities (in higher energy regimes). The depth of the cavities in cpTi Gr-2 treated with the lowest regime parameters was lower than that of Ti6Al4V alloy (0.4 and 5.5 μm, respectively). In cpTi Gr-2, the cavity depth increased mostly with increase in the pulse number while for Ti6Al4V alloy it increased with increasein laser power. The surface of the zone of laser influence and walls of the cavities were covered with layers of different titanium oxides in cp Ti-Gr-2 and with mixed oxides of Ti and Al in the case of Ti6Al4V alloy. The oxides along the cavities walls were characterized with layered morphology, which is finer in Ti6Al4V alloy. The results of this study can be used when applying picosecond pulsed lasers for texturing titanium surfaces to improve their medico-biological properties.
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