Picosecond laser-induced formation of spikes in a single crystal superalloy

Wei Zhang; Guanghua Cheng; Qiang Feng; Lamei Cao

doi:10.1016/j.apsusc.2012.02.056

Picosecond laser-induced formation of spikes in a single crystal superalloy

Wei Zhang, Guanghua Cheng, Qiang Feng, Lamei Cao

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

The characteristics of laser-induced periodic surface structures (LIPSS) were investigated after laser irradiation with different pulse duration under a certain range of laser fluence (0.25 ≤ Φ ≤ 1.91 J/cm ² ) and pulse number (11 ≤ N ≤ 560). Spikes were generated by picosecond laser irradiation in ambient air, in comparison with only periodic ripple structures introduced by nanosecond and femtosecond laser irradiation. Microstructural investigations indicate that these spikes were initiated by the fragment of periodic ripple ridges or corrugation on the smooth surface with subsequent pulses, and their separation increased with increasing the laser fluence. Surface capillary waves associated with the resolidification process can be employed to explain the formation of spikes by picosecond laser irradiation.

Original language	English
Pages (from-to)	9452-9456
Number of pages	5
Journal	Applied Surface Science
Volume	258
Issue number	23
DOIs	https://doi.org/10.1016/j.apsusc.2012.02.056
State	Published - 15 Sep 2012
Externally published	Yes

Keywords

Capillary waves
Picosecond laser
Ripples
Spikes

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10.1016/j.apsusc.2012.02.056

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title = "Picosecond laser-induced formation of spikes in a single crystal superalloy",

abstract = " The characteristics of laser-induced periodic surface structures (LIPSS) were investigated after laser irradiation with different pulse duration under a certain range of laser fluence (0.25 ≤ Φ ≤ 1.91 J/cm 2 ) and pulse number (11 ≤ N ≤ 560). Spikes were generated by picosecond laser irradiation in ambient air, in comparison with only periodic ripple structures introduced by nanosecond and femtosecond laser irradiation. Microstructural investigations indicate that these spikes were initiated by the fragment of periodic ripple ridges or corrugation on the smooth surface with subsequent pulses, and their separation increased with increasing the laser fluence. Surface capillary waves associated with the resolidification process can be employed to explain the formation of spikes by picosecond laser irradiation.",

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T1 - Picosecond laser-induced formation of spikes in a single crystal superalloy

AU - Zhang, Wei

AU - Cheng, Guanghua

AU - Feng, Qiang

AU - Cao, Lamei

PY - 2012/9/15

Y1 - 2012/9/15

N2 - The characteristics of laser-induced periodic surface structures (LIPSS) were investigated after laser irradiation with different pulse duration under a certain range of laser fluence (0.25 ≤ Φ ≤ 1.91 J/cm 2 ) and pulse number (11 ≤ N ≤ 560). Spikes were generated by picosecond laser irradiation in ambient air, in comparison with only periodic ripple structures introduced by nanosecond and femtosecond laser irradiation. Microstructural investigations indicate that these spikes were initiated by the fragment of periodic ripple ridges or corrugation on the smooth surface with subsequent pulses, and their separation increased with increasing the laser fluence. Surface capillary waves associated with the resolidification process can be employed to explain the formation of spikes by picosecond laser irradiation.

AB - The characteristics of laser-induced periodic surface structures (LIPSS) were investigated after laser irradiation with different pulse duration under a certain range of laser fluence (0.25 ≤ Φ ≤ 1.91 J/cm 2 ) and pulse number (11 ≤ N ≤ 560). Spikes were generated by picosecond laser irradiation in ambient air, in comparison with only periodic ripple structures introduced by nanosecond and femtosecond laser irradiation. Microstructural investigations indicate that these spikes were initiated by the fragment of periodic ripple ridges or corrugation on the smooth surface with subsequent pulses, and their separation increased with increasing the laser fluence. Surface capillary waves associated with the resolidification process can be employed to explain the formation of spikes by picosecond laser irradiation.

KW - Capillary waves

KW - Picosecond laser

KW - Ripples

KW - Spikes

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DO - 10.1016/j.apsusc.2012.02.056

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VL - 258

SP - 9452

EP - 9456

JO - Applied Surface Science

JF - Applied Surface Science

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ER -

Picosecond laser-induced formation of spikes in a single crystal superalloy

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Keywords

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