Multi-Scale Structuring of CoCrMo and AZ91D Magnesium Alloys Using Direct Laser Interference Patterning

In this work, the technique of Direct Laser Interference Patterning (DLIP) was used to fabricate micrometric structures at surface Cobalt-Chromium-Molybdenum and AZ91D magnesium alloys. Line-like patterns with spatial periods 5 μm were textured using an ultra-short pulsed laser (10 ps pulse duration 1064 nm wavelength) a two-beam interference setup. The topography, morphology, chemical modifications analysed Confocal Microscopy, Scanning Electron Energy Dispersive Spectroscopy (EDS), respectively. fluence overlap varied evaluate their influence on final structure. Homogeneous achieved for CoCrMo alloy every condition tested, deeper (up 0.85 μm) being higher energy levels (higher and/or fluence). For high energy, sub-micrometric secondary structures, so-called LIPSS, could also be observed CoCrMo. EDS analysis showed some oxidation after texturing. Regarding alloy, 2.5 μm), but more melting observed, forming spherical oxide particles. Nonetheless, these results bring new perspectives fabrication microtextures DLIP.