Multi-scale modeling of phase explosion in high fluence nanosecond laser ablation and clarification of ablation depth prediction criterion

Cao, Yanyan; Shin, Yung C.

doi:10.1016/j.apsusc.2015.08.251

Cited by 19 publications

(10 citation statements)

References 38 publications

(44 reference statements)

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“…The authors of this manuscript previously suggested a thermal model of DLIP for metallic substrates [35]. Cao and Shin predicted the particle motion due to phase explosion during high fluence laser ablation of metals by SPH [36]. Further, Alshaer et al used SPH to simulate the thermal ablation of aluminium at elevated fluences, particularly the ejection of particles by the recoil pressure [37].…”

Section: Introductionmentioning

confidence: 99%

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Demuth

Lasagni

2020

Computation

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Functional surfaces characterised by periodic microstructures are sought in numerous technological applications. Direct laser interference patterning (DLIP) is a technique that allows the fabrication of microscopic periodic features on different materials, e.g., metals. The mechanisms effective during nanosecond pulsed DLIP of metal surfaces are not yet fully understood. In the present investigation, the heat transfer and fluid flow occurring in the metal substrate during the DLIP process are simulated using a smoothed particle hydrodynamics (SPH) methodology. The melt pool convection, driven by surface tension gradients constituting shear stresses according to the Marangoni boundary condition, is solved by an incompressible SPH (ISPH) method. The DLIP simulations reveal a distinct behaviour of the considered substrate materials stainless steel and high-purity aluminium. In particular, the aluminium substrate exhibits a considerably deeper melt pool and remarkable velocity magnitudes of the thermocapillary flow during the patterning process. On the other hand, convection is less pronounced in the processing of stainless steel, whereas the surface temperature is consistently higher. Marangoni convection is therefore a conceivable effective mechanism in the structuring of aluminium at moderate fluences. The different character of the melt pool flow during DLIP of stainless steel and aluminium is confirmed by experimental observations.

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Section: Introductionmentioning

confidence: 99%

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Demuth

Lasagni

2020

Computation

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“…However, complete suppression of the laser-induced particle ejection from the target was difficult. The mechanisms of phase explosion and/or hydrodynamic liquid phase spraying may cause the formation of particles when intensities of the pulsed laser ablation are varied from higher to relatively low [54][55][56].…”

Section: The Structure and Composition Of Mos X Filmsmentioning

confidence: 99%

Performance and Mechanism of Photoelectrocatalytic Activity of MoSx/WO3 Heterostructures Obtained by Reactive Pulsed Laser Deposition for Water Splitting

et al. 2020

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This work studies the factors that affect the efficiency of the photoelectrochemical hydrogen evolution reaction (HER) using MoSx/WO3 nano-heterostructures obtained by reactive pulsed laser deposition (RPLD) on glass substrates covered with fluorinated tin oxide (FTO). Another focus of the research is the potential of MoSx nanofilms as a precursor for MoOz(S) nanofilms, which enhance the efficiency of the photo-activated oxygen evolution reaction (OER) using the MoOz(S)/WO3/FTO heterostructures. The nanocrystalline WO3 film was created by laser ablation of a W target in dry air at a substrate temperature of 420 °C. Amorphous MoSx nanofilms (2 ≤ x ≤ 12) were obtained by laser ablation of an Mo target in H2S gas of varied pressure at room temperature of the substrate. Studies of the energy band structures showed that for all MoSx/WO3/FTO samples, photo-activated HER in an acid solution proceeded through the Z-scheme. The highest photoelectrochemical HER efficiency (a photocurrent density ~1 mA/cm2 at a potential of ~0 V under Xe lamp illumination (~100 mW/cm2)) was found for porous MoS4.5 films containing the highest concentration of catalytically active sites attributed to S ligands. During the anodic posttreatment of porous MoSx nanofilms, MoOz(S) films with a narrow energy band gap were formed. The highest OER efficiency (a photocurrent density ~5.3 mA/cm2 at 1.6 V) was detected for MoOz(S)/WO3/FTO photoanodes that were prepared by posttreatment of the MoSx~3.2 precursor. The MoOz(S) film contributed to the effective photogeneration of electron–hole pairs that was followed by the transport of photoelectrons from MoOz(S) into the WO3 film and the effective participation of holes possessing strong oxidation ability in the OER on the surface of the MoOz(S) film.

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“…When the molten material temperature approaches 0.8-0.9 T c , the stability of the superheated liquid becomes drastically more sensitive on density fluctuations and the homogeneous bubble nucleation rate. The process that the superheated liquid seeks for the equilibrium would lead to its return to the binodal through phase explosion [35][36][37][38]49,50]. Based on the kinetic theory, the phase explosion would be triggered by the spontaneous expansion of bubbles when they reach a critical radius, r c .…”

Section: Laser-materials Interaction Analysismentioning

confidence: 99%

Effect of confinement on surface modification for laser peen forming without protective coating

Shen

Ding

Wang

et al. 2016

Surface and Coatings Technology

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In this study, multiple laser peen forming (LPF) experiments were conducted for micro-bending Aluminum alloy 1060, OHFC Copper, and commercially pure Titanium specimens under confinement media of water and air. Surface morphological and compositional changes as well as the mechanical properties of the treated specimens were experimentally analyzed to determine the effect of confinement during LPF. Significantly different surface morphological characteristics were captured and quantitatively analyzed. Clear feed mark patterns were found to be caused by the laser pulse feed for all materials under air confinement. Under water confinement, specimen surfaces appeared in a tarnished, featureless surface texture without showing any feed marks. The mechanisms of laser-material interaction during LPF were studied for various materials under different confinement media. The surface chemical composition change was investigated on the surface and in depth. More chemical composition change was observed under air confinement than under water, while it was limited within the topmost 10-30 nm under both water and air confinement.

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Multi-scale modeling of phase explosion in high fluence nanosecond laser ablation and clarification of ablation depth prediction criterion

Cited by 19 publications

References 38 publications

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Performance and Mechanism of Photoelectrocatalytic Activity of MoSx/WO3 Heterostructures Obtained by Reactive Pulsed Laser Deposition for Water Splitting

Effect of confinement on surface modification for laser peen forming without protective coating

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