Surface Modification of AZ91D Magnesium Alloy Using Millisecond, Nanosecond and Femtosecond Lasers

Guan, Yanfen; Zhou, Wei; Zheng, Hong; Li, Zhong Li

doi:10.4028/www.scientific.net/kem.447-448.695

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Mg alloys are important engineering materials, and they are widely used in automobile, communication and aerospace industries due to low density and high specific strength. In order to improve their poor surface-related properties, it has been demonstrated that laser surface treatment can be used to further extend the applications of Mg alloys [14,15].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser-induced ripple structures on magnesium

Guan

Zhou

et al. 2013

Appl. Phys. A

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Two types of periodic surface structures including micro-ripples and nano-ripples were observed on magnesium after femtosecond laser irradiation, and color effect was reported by scanning single laser beam over a large area at near damage threshold fluence. Optical reflectance measurement revealed that the color effect was mainly attributed to the nano-ripples as diffraction gratings, and intensity of the color was affected by morphology of the micro-ripples. AFM and SEM images showed that orientation of the micro-ripples was parallel to laser polarization and period of the micro-ripples increased with scanning numbers, while orientation of the nano-ripples was perpendicular to laser polarization and period of the nano-ripples kept constant as laser sub-wavelength with the increasing scanning numbers. These results suggested that formation of the micro-ripples was due to the combined effect of initial surface roughness and near-field interference, while formation of the nano-ripples was caused by the near-field interference between incident light and surface plasmons being excited in the air and metal interface. Potential application of such effect was further proposed.

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Section: Introductionmentioning

confidence: 99%

Femtosecond laser-induced ripple structures on magnesium

Guan

Zhou

et al. 2013

Appl. Phys. A

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“…Considerable effort has been made in the past decade or so to study casting [1,2,3], welding [4], machining [5,6], heat treatment [7,8], phase transformation [9], surface coating [10,11], and laser processing [11,12,13,14,15,16] of various magnesium alloys, including AM50A [5,17], AM60 [1], AZ31B [18], AZ91D [4,7,8,9,10,11,12,13,14,15,16], and Mg-based composites [19,20]. Effort has also been made to study the materials' corrosion mechanisms [7,18,20,21,22,23], biocorrosion behavior [8,13], wear resistance [24], fatigue properties [25] and fracture under dynamic loading [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Intermetallic β-Mg<sub>17</sub>Al<sub>12</sub> on Fracture of Ultralight Magnesium Alloy

Guan

Zhou

2013

KEM

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An AZ91D magnesium alloy was tested in either compression or tension, and extensive observation of the tested samples was carefully carried out to understand the fracture initiation and propagation processes. Cracking of β-Mg17Al12 intermetallic compounds was found to occur easily in plastic zones under either compressive or tensile loading. However, the cracking did not necessarily result in fracture propagation. It is argued that the fracture is controlled by the microcrack propagation.

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“…3 shows typical solidification microstructure of AZ91D Mg alloy irradiated with nanosecond pulse Nd:YAG laser. As shown inFigure 7.3 (a),…”

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confidence: 99%

Laser surface processing of ultralight magnesium alloys

Guan

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for making the effort to participate in my qualifying examination. Second, I would like to express my appreciation to Machining Technology Group from Singapore Institute of Manufacturing Technology for providing me privileges to use their facilities and for providing great help through my study. I would like to thank Dr. Zheng Hongyu for his brilliant guidance and caring financial support. He opened up a whole new world of laser science to me. I am also grateful to Dr. Li Zhongli for her countless contribution to this work. Her great knowledge on lasers and ingenious experimental techniques has helped me numerous difficulties and guided me to become a skilled researcher. Third, I would like to thank the other great members of our research group for their nice friendship on my research work and life during the past four years.

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Surface Modification of AZ91D Magnesium Alloy Using Millisecond, Nanosecond and Femtosecond Lasers

Cited by 3 publications

References 22 publications

Femtosecond laser-induced ripple structures on magnesium

Femtosecond laser-induced ripple structures on magnesium

Effect of Intermetallic β-Mg<sub>17</sub>Al<sub>12</sub> on Fracture of Ultralight Magnesium Alloy

Laser surface processing of ultralight magnesium alloys

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