Short and Ultrashort Pulsed Laser Processing of Zinc: Resolidification Morphology of Ablated Craters

Laser surface texturing of polycrystalline zinc in bulk form and as galvanised coatings is performed with single, as well as multiple nanosecond and picosecond laser pulses at a wavelength of 1030 nm By varying the laser fluence over a wide range, as well as varying the number of pulses on the same...

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Bibliographic Details
Published in:Journal of laser micro nanoengineering 2018-12, Vol.13 (3), p.178-188
Main Authors: Mustafa, H, Jalaal, M, Ya, W, Rahman, N. Ur, Matthews, D.T.A, Romer, G.R.B.E
Format: Article
Language:English
Subjects:
Ablation
Cathodic protection
Craters
Experiments
Fluence
Galvanized steel
Laser processing
Lasers
Mechanical properties
Microscopy
Morphology
Picosecond pulses
Production processes
Steel products
Subsystems
Surface waves
Temperature gradients
Texturing
Ultrashort pulsed lasers
Zinc
Zinc (Metal)
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Summary:Laser surface texturing of polycrystalline zinc in bulk form and as galvanised coatings is performed with single, as well as multiple nanosecond and picosecond laser pulses at a wavelength of 1030 nm By varying the laser fluence over a wide range, as well as varying the number of pulses on the same location, thousands of ablated craters can be fabricated and their morphology studied. From the analysis thereof, it can be concluded that, within the boundaries of our experimental (laser) conditions, ablated craters always show molten features. Depending on the pulse fluence and duration, the final solidifed morphology can feature jets with meso- and micro scale spherical endings, micro rims and protrusions, as well as nano-roughness or a rim around the ablated crater. If the laser fluence is high one observes the evidence of surface waves and finger formation, resulted from different types of hydrodynamic instablity. In contrast to nanosecond laser processing, it is found that craters formed using picosecond pulses deviate significantly from the Gaussian shape of the laser intensity distribution at high laser intensity, due to different temperature gradients in the electronic and lattice subsystems.Keywords: ultrashort laser, ablation, surface morphology, polycrystalline zinc, coated steel, splash hump, rim
ISSN:1880-0688
1880-0688
DOI:10.2961/jlmn.2018.03.0006