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Materials 2018, 11(1), 50; doi:10.3390/ma11010050

Power Spectral Density Evaluation of Laser Milled Surfaces

1
German Aerospace Center (DLR), Institute of Technical Physics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
2
Institut für Strahlwerkzeuge, University of Stuttgart, Pfaffenwaldring 43, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 20 November 2017 / Revised: 12 December 2017 / Accepted: 22 December 2017 / Published: 29 December 2017
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Abstract

Ablating surfaces with a pulsed laser system in milling processes often leads to surface changes depending on the milling depth. Especially if a constant surface roughness and evenness is essential to the process, structural degradation may advance until the process fails. The process investigated is the generation of precise thrust by laser ablation. Here, it is essential to predict or rather control the evolution of the surfaces roughness. Laser ablative milling with a short pulse laser system in vacuum (≈1 Pa) were performed over depths of several 10 µm documenting the evolution of surface roughness and unevenness with a white light interference microscope. Power spectral density analysis of the generated surface data reveals a strong influence of the crystalline structure of the solid. Furthermore, it was possible to demonstrate that this effect could be suppressed for gold. View Full-Text
Keywords: surface roughness; surface unevenness; laser milling; power spectral density; micro crystalline; Hall-Petch; EBSD surface roughness; surface unevenness; laser milling; power spectral density; micro crystalline; Hall-Petch; EBSD
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Lorbeer, R.-A.; Pastow, J.; Sawannia, M.; Klinkenberg, P.; Förster, D.J.; Eckel, H.-A. Power Spectral Density Evaluation of Laser Milled Surfaces. Materials 2018, 11, 50.

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