Study of the interplay of vaporisation, melt displacement and melt ejection mechanisms under multiple pulse irradiation of metals

Fishburn, J.M.; Withford, Michael J.; Coutts, David W.; Piper, James A.

doi:10.1016/j.apsusc.2005.12.168

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…Then, the higher irradiance levels in the center of the Gaussian profile lead to preferential displacement/ejection of material from deeper rather than wider locations as the pulse sequence irradiates the surface. [ 44 ] With regard to the degradation performance, even if all the surface is covered by a protective layer, relatively thicker layers of recast material are preferable, as they would provide improved self‐repairing ability if corrosion starts at any eventual defect or irregularity of the layer. This can explain the observed corrosion trends for varying scanning speed (T1 versus T2, T3 versus T4 in Figure 1b).…”

Section: Resultsmentioning

confidence: 99%

Laser‐Guided Corrosion Control: A New Approach to Tailor the Degradation of Mg‐Alloys

Pou-Álvarez

Riveiro

Nóvoa

et al. 2021

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Despite corrosion being commonly seen as a problem to be avoided, applications such as batteries or biodegradable implants do benefit from corrosion‐like phenomena. However, current strategies address corrosion control from a global perspective for a whole component, without considering local adaptations to functionality specifications or inhomogeneous environments. Here, a novel concept is presented: the local control and guidance of corrosion through a laser surface treatment. Immersion tests in saline solution of AZ31 magnesium alloy samples show degradation rates reduced up to 15 times with the treatment, owing to a fast passivation after the induced microstructural modifications. By controlling the treatment conditions, the degradation can be restricted to delimited regions and driven towards specific directions. The applicability of the method for the design of tailored degradation biomedical implants is demonstrated and uses for cathodic protection systems and batteries can also be anticipated.

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Section: Resultsmentioning

confidence: 99%

Laser‐Guided Corrosion Control: A New Approach to Tailor the Degradation of Mg‐Alloys

Pou-Álvarez

Riveiro

Nóvoa

et al. 2021

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“…This explosive expel of material is due to subsurface boiling with high pressure that lead in cones formation by resolidification. The distance between these cones formed in a particular sequence depends upon the surface properties of melted region [4,[17][18]. A plot of distance between adjacent cones and corresponding zone lengths measured from ablated region is shown in Figure 2(e).…”

Section: Resultsmentioning

confidence: 99%

Microstructural Morphological Changes in Laser Irradiated Platinum

Latif¹,

Khaleeq-ur-Rahman²,

Bhatti³

et al. 2011

JMP

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The micro structural morphological investigations of the laser exposed samples of Platinum are presented. Q-Switched Nd: YAG laser (1064 nm, 1.1 MW, 9-14 ns) represented by Gaussian profile, power density 3 × 10 15 Watt/m 2 and focal spot size 12 µm is used to irradiate the targets (4 N, 1 × 1 × 0.3 cm 3). Surface modifications are observed and examined for optimized 50 pulses in air (1 atm) as well as under vacuum (~10-3 torr) by analyzing SEM micrographs. Ripples, cones, crater and hillocks formation, splashing, sputtering, solidification and redeposition are observed as main modifications at the irradiated surface. It is explored that material is ejected with explosive expel. Motic digital microscope is used for the measurements of ablated micron sized droplets. The average distance between the adjacent cones is larger near the crater region. Topographical changes are characterized applying Atomic Force Microscopy. RMS surface roughness, hillocks and crater sizes on the irradiated surfaces are also calculated. The structural analysis is mainly focused on measurements of grain sizes, diffracted X-Rays intensity and interplanar distance. The results thus obtained determine that IR radiations are unable to change interplanar distance of the target where as changes in diffracted x-rays intensity and grain sizes for irradiated platinum are noticed.

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“…The fluid in the molten pool flows from the low surface tension to the high surface tension. Therefore, the melt flows from the center to the outside, and the accumulation is formed [ 23 , 24 ].…”

Section: Analysis and Discussionmentioning

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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Study of the interplay of vaporisation, melt displacement and melt ejection mechanisms under multiple pulse irradiation of metals

Cited by 14 publications

References 11 publications

Laser‐Guided Corrosion Control: A New Approach to Tailor the Degradation of Mg‐Alloys

Laser‐Guided Corrosion Control: A New Approach to Tailor the Degradation of Mg‐Alloys

Microstructural Morphological Changes in Laser Irradiated Platinum

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

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