Double-pulse femtosecond laser peening of aluminum alloy AA5038: Effect of inter-pulse delay on transient optical plume emission and final surface micro-hardness

Double-pulse ablative femtosecond laser peening of the AA5038 aluminum alloy surface in the phase explosion regime results in its enhanced microhardness, which monotonously decreases till the initial value versus inter-pulse delay, increasing on a sub-nanosecond timescale. Optical emission spectrosc...

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Veröffentlicht in:Applied physics letters 2016-11, Vol.109 (21)
Hauptverfasser: Ageev, E. I., Bychenkov, V. Yu, Ionin, A. A., Kudryashov, S. I., Petrov, A. A., Samokhvalov, A. A., Veiko, V. P.
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Sprache:eng
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Zusammenfassung:Double-pulse ablative femtosecond laser peening of the AA5038 aluminum alloy surface in the phase explosion regime results in its enhanced microhardness, which monotonously decreases till the initial value versus inter-pulse delay, increasing on a sub-nanosecond timescale. Optical emission spectroscopy of the double-pulse ablative plume reveals the same trend in the yield of the corresponding atomic and ion emission versus inter-pulse delay, enlightening the interaction of the second femtosecond laser pump pulse with the surface and the resulting plume.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4968594