Effect of processing environment on laser-induced darkening evolution in magnesium alloy
Guan, Ying Chun
Li, Zhong Li
Zheng, Hong Yu
Date of Issue2013-08-15
School of Mechanical and Aerospace Engineering
Singapore Institute of Manufacturing Technology
Laser-induced darkening effect is an important phenomenon for Mg alloys to provide potential engineering applications in product identification, photocatalysts, and bio-optical implants. This work reports darkening evolution on Mg alloy by KrF excimer laser irradiation. Effort was made to study how processing environment influence morphological evolution and chemical variation of laser-irradiated surface. All irradiated surfaces were characterized using Talysurf surface profiler, atomic force microscope, scanning electron microscope and energy dispersive X-ray spectrometer. The results showed that oxygen content played a critical role in determining darkening effect on the Mg alloy, and surface morphology transferred from network structures to granular structures and protruding oxide particles when darkening occurred. Mechanism of laser-induced darkening in Mg alloy was further discussed.
Darkening; Excimer laser; Magnesium alloy; Oxidation
Optics and Lasers in Engineering
© 2013 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Optics and Lasers in Engineering, 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: [http://dx.doi.org/10.1016/j.optlaseng.2013.07.018].