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Title: Darkening effect on AZ31B magnesium alloy surface induced by nanosecond pulse Nd:YAG laser
Authors: Guan, Y.C.
Zhou, W.
Zheng, H.Y.
Li, Z.L.
Keywords: Darkening; Nanosecond Pulse Laser; Magnesium Alloy; Clusters; Oxidation.
Issue Date: 2013
Source: Guan, Y., Zhou, W., Zheng, H.,& Li, Z. (2013). Darkening effect on AZ31B magnesium alloy surface induced by nanosecond pulse Nd:YAG laser. Applied Surface Science, 280, 462-466.
Series/Report no.: Applied Surface Science
Abstract: Permanent darkening effect was achieved on surface of AZ31B Mg alloy irradiated with nanosecond pulse Nd:YAG laser, and special attention was made to examine how surface structure as well as oxidation affect the darkening effect. Experiments were carried out to characterize morphological evolution and chemical composition of the irradiated areas by optical reflection spectrometer, Talysurf surface profiler, SEM, EDS, and XPS. The darkening effect was found to be occurred at the surface under high laser energy. Optical spectra showed that the induced darkening surface was uniform over the spectral range from 200 nm to 1100 nm. SEM and surface profiler showed that surface morphology of darkening areas consisted of large number of micron scale cauliflower-like clusters and protruding particles. EDS and XPS showed that compared to non-irradiated area, oxygen content at the darkening areas increased significantly. It was proposed a mechanism that involved trapping of light in the surface morphology and chemistry variation of irradiated areas to explain the laser-induced darkening effect on AZ31B Mg alloy.
ISSN: 0169-4332
DOI: 10.1016/j.apsusc.2013.05.011
Schools: School of Mechanical and Aerospace Engineering 
Organisations: A*STAR SIMTech
Rights: © 2013 Published by Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Surface Science, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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