首页|Surface Modification of AZ91D Magnesium Alloy using Millisecond, Nanosecond and Femtosecond Lasers
Surface Modification of AZ91D Magnesium Alloy using Millisecond, Nanosecond and Femtosecond Lasers
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NETL
NSTL
Trans Tech Publications Ltd
Poor surface properties of magnesium alloys limit their extensive use in many applications. Laser surface engineering can be used to enhance surface-related properties of Mg alloys, and the purpose of this paper is to study the effect of laser pulse duration on surface of AZ91D Mg alloy. After millisecond-pulse laser treatment, ripples and cellular/dendrite as well as nanoscale β-Mg_(17)Al_(12) precipitates in the α-Mg matrix were found in the surface microstructure, moreover, the melt depth was more than 150 micron. After nanosecond-pulse laser treatment, craters of 10 to 50 micron in diameter were observed on the surface due to plasma expansion and melted matter ejection during local boiling process, and the melt depth was nearly 15 micron. However, femtosecond-pulse laser treatment produced various micro- and nano-structures within a very thin layer on the surface.
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075
Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075
NETL
NSTL
Trans Tech Publications Ltd
