EFFECT OFNd:YAGLASER MELTING ON SURFACE ENERGY OF AZ91DMgALLOY

Y. C. Guan, W. Zhou () and H. Y. Zheng
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Y. C. Guan: Precision Engineering and Nanotechnology Center, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
W. Zhou: Precision Engineering and Nanotechnology Center, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;
H. Y. Zheng: Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore

Surface Review and Letters (SRL), 2009, vol. 16, issue 06, 801-806

Abstract: Laser surface melting is known to alter surface energy and wettability of a few engineering materials, but its effect on magnesium alloys has never been reported. Effort was made to study howNd:YAGlaser irradiation influenced surface energy of an AZ91D magnesium alloy. Contact angle measurement was carried out using three types of liquids to make it possible to calculate the surface energy quantitatively based upon the acid–base theory. The laser irradiation was found to enhance surface wettability significantly and lead to a drastic increase in surface energy from 25.82 to 40.78 mJ/m2. The change in surface property was attributed to the laser-induced refinement ofα-Mgandβ-Mg17Al12phases and enrichment ofAlin the microstructure.

Keywords: Laser; magnesium alloy; microstructure; surface energy; wettability (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09013347

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