Microstructure and corrosion behavior of laser induced periodic patterned titanium based alloy

[Display omitted] •Linear patterns on Ti-6Al-4V developed by ArF excimer laser.•Presence of porosities and micro-protrusion in Fiber laser patterned surface.•Improved wettability with a maximum when patterned with fiber laser.•Improved corrosion resistance due to laser pattering.•Improved apatite de...

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Bibliographic Details
Published in:	Optics and laser technology 2019-08, Vol.116, p.196-213
Main Authors:	Kumari, Renu, Pfleging, Wilhelm, Besser, Heino, Majumdar, Jyotsna Dutta
Format:	Article
Language:	eng
Subjects:	Apatite ArF laser Corrosion Corrosion rate Excimer lasers Excimers Fiber laser Fiber lasers Fluence Laser surface patterning Lasers Microstructure Pulse repetition rate Surface energy Ti-6Al-4V Titanium alloys Titanium base alloys Titanium dioxide
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Summary:	[Display omitted] •Linear patterns on Ti-6Al-4V developed by ArF excimer laser.•Presence of porosities and micro-protrusion in Fiber laser patterned surface.•Improved wettability with a maximum when patterned with fiber laser.•Improved corrosion resistance due to laser pattering.•Improved apatite deposition on laser patterned textured surface. In this study, the effect of laser induced periodic patterning of α-β titanium alloy (Ti-6Al-4V) developed by excimer laser (ArF, with a laser fluence of 2.4 J/cm2, a laser pulse repetition rate of 200 Hz and 50 laser pulses) and Fiber laser (using a power of 5 W, frequency of 80 kHz, scan speed of 800 mm/s and 2 times scanning) on its microstructure and corrosion behaviour have been investigated. The microstructure of the patterned surface shows a significant refinement of grains with the presence of α and β. A very low mass fraction of TiO2 was noticed when patterning was performed using ArF laser. A significant improvement in total surface energy (from 37 mN/m for Ti-6Al-4V to 41 mN/m for ArF laser patterned surface and 40 mN/m for Fiber laser patterned surface) and polar energy (from 11 mN/m for Ti-6Al-4V to 26 mN/m for ArF laser patterned surface and 24 mN/m for Fiber laser patterned surface) have been observed. Corrosion rate was reduced due to laser patterning (from 6.12 mm/year for as-received Ti-6Al-4V to 2.17 × 10−2 mm/year for ArF laser patterned and 1.68 × 10−2 mm/year for Fiber laser patterned Ti-6Al-4V surfaces). Laser surface patterning improved apatite deposition from 15% area coverage for Ti-6Al-4V to 34% and 33% area coverage for ArF and Fiber laser patterned surfaces, respectively.
ISSN:	0030-3992 1879-2545