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Article

FIB-SEM Investigation of Laser-Induced Periodic Surface Structures and Conical Surface Microstructures on D16T (AA2024-T4) Alloy

by
Igor A. Salimon
1,*,
Sakellaris Mailis
1,
Alexey I. Salimon
2,*,
Evgenij Skupnevskiy
3,
Svetlana A. Lipovskikh
2,
Iaroslava Shakhova
4,
Artem V. Novikov
2,5,
Timur F. Yagafarov
1 and
Alexander M. Korsunsky
2,6
1
Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
2
Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
3
Lasers & Apparatus Ltd., Zelenograd 124482, Russia
4
Advanced Imaging Core Facility, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
5
Institute of Problems of Chemical Physics of Russian Academy of Sciences, Chernogolovka 141432, Russia
6
MBLEM laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(1), 144; https://doi.org/10.3390/met10010144
Submission received: 6 December 2019 / Revised: 12 January 2020 / Accepted: 14 January 2020 / Published: 17 January 2020
(This article belongs to the Special Issue Advanced Surface Enhancement)
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Abstract

The use of aluminum alloy AA2024-T4 (Russian designation D16T) in applications requiring a high strength-to-weight ratio and fatigue resistance such as aircraft fuselage often demands the control and modification of surface properties. A promising route to surface conditioning of Al alloys is laser treatment. In the present work, the formation of ripples and conical microstructures under scanning with femtosecond (fs) laser pulses was investigated. Laser treatment was performed using 250 fs pulses of a 1033 nm Yb:YAG laser. The fluence of the pulses varied from 5 to 33 J/cm2. The scanning was repeated from 1 to 5 times for different areas of the sample. Treated areas were evaluated using focused ion beam (FIB)- scanning electron microscopy (SEM) imaging and sectioning, energy-dispersive X-ray (EDX) spectroscopy, atomic force microscopy (AFM), and confocal laser profilometry. The period of laser-induced periodic surface structures (LIPSS) and the average spacing of conical microstructures were deduced from SEM images by FFT. Unevenness of the treated areas was observed that is likely to have been caused by ablation debris. The structural and elemental changes of the material inside the conical microstructures was revealed by FIB-SEM and EDX. The underlying formation mechanisms of observed structures are discussed in this paper.
Keywords: aluminum alloy 2024; LIPSS; femtosecond laser; conical microstructures aluminum alloy 2024; LIPSS; femtosecond laser; conical microstructures

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MDPI and ACS Style

Salimon, I.A.; Mailis, S.; Salimon, A.I.; Skupnevskiy, E.; Lipovskikh, S.A.; Shakhova, I.; Novikov, A.V.; Yagafarov, T.F.; Korsunsky, A.M. FIB-SEM Investigation of Laser-Induced Periodic Surface Structures and Conical Surface Microstructures on D16T (AA2024-T4) Alloy. Metals 2020, 10, 144. https://doi.org/10.3390/met10010144

AMA Style

Salimon IA, Mailis S, Salimon AI, Skupnevskiy E, Lipovskikh SA, Shakhova I, Novikov AV, Yagafarov TF, Korsunsky AM. FIB-SEM Investigation of Laser-Induced Periodic Surface Structures and Conical Surface Microstructures on D16T (AA2024-T4) Alloy. Metals. 2020; 10(1):144. https://doi.org/10.3390/met10010144

Chicago/Turabian Style

Salimon, Igor A., Sakellaris Mailis, Alexey I. Salimon, Evgenij Skupnevskiy, Svetlana A. Lipovskikh, Iaroslava Shakhova, Artem V. Novikov, Timur F. Yagafarov, and Alexander M. Korsunsky. 2020. "FIB-SEM Investigation of Laser-Induced Periodic Surface Structures and Conical Surface Microstructures on D16T (AA2024-T4) Alloy" Metals 10, no. 1: 144. https://doi.org/10.3390/met10010144

APA Style

Salimon, I. A., Mailis, S., Salimon, A. I., Skupnevskiy, E., Lipovskikh, S. A., Shakhova, I., Novikov, A. V., Yagafarov, T. F., & Korsunsky, A. M. (2020). FIB-SEM Investigation of Laser-Induced Periodic Surface Structures and Conical Surface Microstructures on D16T (AA2024-T4) Alloy. Metals, 10(1), 144. https://doi.org/10.3390/met10010144

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