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. 2023 Mar 21;16(6):2498.
doi: 10.3390/ma16062498.

Heat Accumulation-Induced Surface Structures at High Degrees of Laser Pulse Overlap on Ti6Al4V Surfaces by Femtosecond Laser Texturing

Farkhod Babadjanov  1 , Uwe Specht  1 , Thomas Lukasczyk  1 , Bernd Mayer  1   2
Affiliations

Heat Accumulation-Induced Surface Structures at High Degrees of Laser Pulse Overlap on Ti6Al4V Surfaces by Femtosecond Laser Texturing

Farkhod Babadjanov et al. Materials (Basel). .

Abstract

In this work, femtosecond laser pulses at high repetition rates were used to fabricate unique microstructures on the surface of Ti6Al4V. We investigated the influence of pulse overlap and laser repetition rates on structure formation. Laser texturing with a high degree of overlap resulted in melting of the material, leading to the formation of specific microstructures that can be used as cavities for drug delivery. The reason for melt formation is attributed to local heat accumulation at high repetition rates. Such structures can be fabricated on materials with low thermal conductivity, which prevent heat dissipation into the bulk of the material. The heat accumulation effect has also been demonstrated on steel, which also has low thermal conductivity.

Keywords: Ti6Al4V; laser pulse overlap; structures for drug delivery; ultrashort pulsed laser.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
SEM images of structures on Ti alloy fabricated at 150 kHz, 500 kHz, and 1 MHz.
Figure 2
Figure 2
CLSM results of surface topography evolution during laser texturing: (a) Representative CLSM image of the surface profile at a measured position (black line); (b) mean extreme values at a measured position at f = 150 kHz, f = 500 kHz, and f = 1 MHz (measuring position and mean deviation from N = 5 measurements).
Figure 3
Figure 3
SEM images of microstructures on steel and copper fabricated with a repetition rate of 500 kHz at pulse overlap 99.93%.
See this image and copyright information in PMC

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