Micro and sub-micron surface structuring of AZ31 by laser re-melting and dimpling

Chromium oxide formation on nanosecond and femtosecond laser irradiated thin chromium films

“…The relaxation time of the electronic temperature is longer with the nanosecond laser as compared to the femtosecond laser interaction [20]. This leads to longer residual heat in the coatings exposed to the nanosecond laser which implies greater heat accumulation in the coatings which can result in the lattice damage, which can be observed on the morphology of the treated sample [21]. It should be noted that the thickness of the films is much smaller than the heat diffusion length with nanosecond pulses, which is in the range of few micrometers.…”

Laser surface structuring affects polymer deposition, coating homogeneity, and degradation rate of Mg alloys

“…Demir et al [14] reported that worms surface type could be a potential treatment to enhance deposition of a polymeric coating over Mg-based alloys. This surface treatment reduced contact angle without any surface damage or excessive oxidation [19]. Table 1 reports the main properties of the surface types before and after coating application.…”

Laser surface texturing of β-Ti alloy for orthopaedics: Effect of different wavelengths and pulse durations

“…The vapour exerts pressure on the molten material to expel it violently causing the small fragments and droplets around the processing region. High surface to volume ratio of such particulate generates a fast cooling cycle leading into the chaotic texture forms [40]. Such chaotic textures were observed on an alpha-Ti alloy under multiple scan passes [47].…”

“…The surface texture is then composed of small droplets of condensed material, which is a sign of explosive behavior during the process. During the solidification, often fractal forms appear generating a hierarchical nano-to micro-surface texture with a chaotic form [40,41]. Undercuts were also formed due to the violent melt flow during the process.…”