Investigation of phase explosion in aluminum induced by nanosecond double pulse technique

Jafarabadi, Marzieh Akbari; Mahdieh, Mohammad Hossein

doi:10.1016/j.apsusc.2015.03.158

Cited by 26 publications

(8 citation statements)

References 28 publications

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“…Laser treatments of aluminum surfaces are commonly used to enhance their roughness and to produce specific structures at micro- and nanoscales. These processes have been widely studied and modeled in the literature where various laser ablation regimes, denoted thermal and explosive, have been identified. ,,− The use of laser techniques to modify the wetting properties of aluminum has been also reported in the literature. ,− …”

Section: Resultsmentioning

confidence: 99%

Hydrophobicity, Freezing Delay, and Morphology of Laser-Treated Aluminum Surfaces

et al. 2019

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Until recently, superhydrophobicity was considered as a hint to predict surface icephobicity, an association of concepts that is by no means universal and that has been proven to depend on different experimental factors and material properties, including the actual morphology and chemical state of surfaces. This work presents a systematic study of the wetting and freezing properties of aluminum Al6061, a common material widely used in aviation, after being subjected to nanosecond pulsed IR laser treatments to modify its surface roughness and morphology. All treated samples, independent of their surface finishing state, presented initially an unstable hydrophilic wetting behavior that naturally evolved with time to reach hydrophobicity or even superhydrophobicity. To stabilize the surface state and to bestow the samples with a permanent and stable hydrophobic character, laser-treated surfaces were covered with a thin layer of CF x prepared by plasmaenhanced chemical vapor deposition. A systematic comparison between freezing delay (FD) and wetting properties of water droplets onto these plasma-/polymer-modified laser-treated surfaces that, under conditions where a heterogeneous nucleation mechanism prevails, surface morphology rather than the actual value of the surface roughness parameter the key feature for long FD times. In particular, it is found that surface morphologies rendering a Cassie−Baxter wetting regime longer FDs than those characterized by a Wenzel-like wetting state. It is that laser treatment, with or without additional coverage with thin CF x coatings, affects wetting and ice formation behaviors and might be an efficient procedure to mitigate icing problems on metal surfaces.

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Section: Resultsmentioning

confidence: 99%

Hydrophobicity, Freezing Delay, and Morphology of Laser-Treated Aluminum Surfaces

et al. 2019

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“…When the nanosecond laser stops, the plasma plume decays. The strong turbulence occurs on the surface of the target [ 20 , 21 , 22 ]. In Figure 5 b, when the nanosecond laser spot is smaller, the volume of the plasma plume is also relatively smaller, and no splattering occurs on the surface of the target.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Spot Size Combination Mode on Ablation Morphology of Aluminum Alloy by Millisecond-Nanosecond Combined-Pulse Laser

Yuan

Zhang

et al. 2018

Materials

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Ablation morphology affects the quality of laser processing. Therefore, the control of ablation morphology is very important. The influence of spot size combination mode on the ablation morphology of aluminum alloy is studied for the first time. Experimental results show that when the nanosecond laser spot is larger, the ablation morphology looks like a bowl-shape, and there is little solidification near the edge. When the nanosecond laser spot is smaller, the shape of the ablation morphology is similar to a hole, and the protuberance is formed near the edge of the cavity. Through the analysis and simulation of the physical model, the physical mechanism, which describes the influence of the spot size combination mode on the molten pool, is discussed. The research results of this paper have important guiding significance for the control of laser processing effect.

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“…A mixture of particles from several microns to several hundred microns, vapors, clusters and ionized nanoclusters generated during the process of evaporation or ionization of pain [37,38], which diffused outwards and deposited on the surface of the silicon wafer [39], as shown in Figure 15. The collected particles, ranging in size from micrometers to nanometers, can be seen in a variety of shapes, including flakes, clumps, and spheres.…”

Section: Characterization Of Particles Collected On Silicon Wafersmentioning

confidence: 99%

Effect of Defocused Nanosecond Laser Paint Removal on Mild Steel Substrate in Ambient Atmosphere

et al. 2021

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The obvious advantages of laser paint removal technology make it a viable alternative to traditional paint removal methods. Infrared nanosecond laser was used to remove paint from car body. The microstructure, composition, surface roughness, hardness and ablative products of the samples were analyzed. The effect of the process combination of laser defocus distance and ambient atmosphere (ambient air, compressed air and inert atmosphere) on the substrate damage and the paint removal effectiveness was explored, and the related mechanism was discussed. Defocus not only changed the fluence of laser spot but also increased the spot diameter. The effect of defocused laser paint removal on the paint and substrate was caused by the superposition of these two factors. The results show that the laser with defocus distance of +4 mm effectively removed the paint in inert atmosphere and has the least adverse effect on the substrate. The content of C element and organic components on the substrate surface was the lowest, and its surface roughness and hardness was very close to the uncoated substrate. Focused laser paint removal in ambient air caused the most serious damage to the substrate. Its surface microhardness increased by 11 HV, and the influence depth reached 37 µm. The mechanism of laser paint removal without auxiliary gas is the superposition of laser plasma effect, laser gasification effect and thermal stress effect. In open atmosphere (compressed air and inert atmosphere), the mechanism of laser paint removal is laser gasification effect and thermal stress effect. This research can provide practical references and theoretical basis for the large-scale industrial application of low/non-damage laser paint removal technology.

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Investigation of phase explosion in aluminum induced by nanosecond double pulse technique

Cited by 26 publications

References 28 publications

Hydrophobicity, Freezing Delay, and Morphology of Laser-Treated Aluminum Surfaces

Hydrophobicity, Freezing Delay, and Morphology of Laser-Treated Aluminum Surfaces

The Effect of Spot Size Combination Mode on Ablation Morphology of Aluminum Alloy by Millisecond-Nanosecond Combined-Pulse Laser

Effect of Defocused Nanosecond Laser Paint Removal on Mild Steel Substrate in Ambient Atmosphere

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