Research Information System
Proceeding Book of 3rd International Conference on Pioneer and Innovative Studies ICPIS 2025, Konya, Turkey, 6 - 07 October 2025, no.2, pp.156-165, (Full Text)
Abstract
AA2024-T3 plates were circularly microtextured using a 1064-nm pulsed fiber laser (100 W, 100 kHz) to examine how scale factor (SF = 100, 150, 250 µm) and scan speed (250, 500, 750 mm s⁻¹) tune wettability and roughness. Sessile-drop tests with 5 ± 0.5 µL DI water and ISO 25178 profilometry (Nanovea PS-50, 3×3 mm, 5 µm step) quantified responses. Contact angle spanned 69–96° relative to the 92° untextured reference. For fixed speed, SF showed a non-monotonic trend: at 250 mm s⁻¹, θ decreased from 96° (SF100) to 77° (SF150), then increased to 87° (SF250); the same pattern occurred at 500 mm s⁻¹ (87 to 70 to 77°) and 750 mm s⁻¹ (85 to 69 to 86°). The most hydrophilic state was 69° at SF150/750 mm s⁻¹ (−23° vs reference). Areal roughness Sa ranged from 0.711 µm (SF250/750 mm s⁻¹) to 3.267 µm (SF100/750 mm s⁻¹). Optical microscopy revealed parameter-dependent rim continuity, spatter, and HAZ width; SF150/750 mm s⁻¹ produced the most homogeneous rings, whereas SF250/750 mm s⁻¹ generated shallow, partially discontinuous rims. Correlating Sa and θ indicates that topology plus rim integrity, rather than roughness amplitude alone, governs wetting-enabling targeted tuning of AA2024-T3 surfaces for fluid-contact applications.