Abstract
In the present study, laser periodic structuring of titanium-based alloy (Ti-6Al-4V) has been carried out using Ti:Sapphire laser with the wavelength of 800 nm and pulse duration of 3 ps and 100 fs with varying peak fluence and scan speed. After laser irradiation, the topography of the surface has been recorded using 3D surface profilometer. Laser surface processing leads to the formation of a periodically patterned surface with the average ablation depth of 37.25 µm-42.13 and average surface roughness of 0.991-1.862 µm as compared to 0.169 µm average roughness of as-received Ti-6Al-4V. In the microstructure, there is presence of fine periodic ripples with an average ripple width of 0.48 µm to 0.54 µm when processed with 3 ps laser and the average ripple width of 0.17 μm in addition to the presence of very fine pits, deposited particle, and oxide dispersed surface when processed with 100 fs laser. The microhardness of the surface is improved (395 VHN-373 VHN ) as compared to 282 VHN of as-received Ti-6Al-4V. There is a significant improvement in the corrosion resistance in terms of a decrease in corrosion rate (0.0037 to 0.0008 mm/year) in laser surface processed sample as compared to as-received Ti-6Al-4V (0.0932 mm/year) in Hank’s solution and also increase in pitting corrosion resistance in terms of increase in critical potential for pit formation (Epit) under a few employed parameters with both 3 ps laser (at a laser fluence of 0.063 J/cm2 and a scan speed of 20 mm/sec) and 100 fs laser (at a laser fluence of 0.63 J/cm2 and at a scan speed of 60 mm/sec).
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Partial financial supports from Department of Science and Technology (DST), N. Delhi (DST/TSG/AMT/2015/636/G, Dt. 18-06-2018 and DST/TDT/AMT/2017/074 (G), Dt. 12-09-2018) and Alexander von Humboldt Foundation are gratefully acknowledged. Experimental supports from ARCI, Hyderabad Central Research Facility, Indian Institute of Technology Kharagpur, India are gratefully acknowledged.
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This invited article is part of a special topical focus in the Journal of Materials Engineering and Performance on Surface Engineering. The issue was organized by Dr. M.K. Banerjee, Malaviya National Institute of Technology, Jaipur.
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Dileep, M., Bathe, R., Manna, I. et al. Ultrafast Laser-Induced Periodic Structuring of Titanium Alloy (Ti-6Al-4V). J. of Materi Eng and Perform 30, 4000–4011 (2021). https://doi.org/10.1007/s11665-021-05779-0
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DOI: https://doi.org/10.1007/s11665-021-05779-0