Features of Vanadium-Surface Damage Induced by Pulsed Laser Radiation

Autor: I. V. Borovitskaya, E. E. Kazilin, S. N. Korshunov, A. N. Mansurova, G G Bondarenko, V. V. Paramonova, A. I. Gaidar, A. B. Mikhailova
Rok vydání: 2020
Předmět:
Zdroj: Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 14:484-489
ISSN: 1819-7094
1027-4510
DOI: 10.1134/s1027451020020068
Popis: The features of the damage of the surface layer of vanadium under the action of pulsed laser radiation are studied. Laser irradiation is carried out in air using a GOS 1001 setup in the Q-switching mode with the following parameters: flux power density q = 1.2 × 108 W/cm2, pulse duration τ0 = 50 ns, and number of pulses N = 1–6. The typical surface damages induced by the laser pulses are found to include the melting of material, a microcrack network, a wavy relief, and drop-like particles. The central region characterized by the greatest degree of damage contains also individual drops of metal, which crystallized like a spiral. The heat-affected zone (HAZ) adjacent to the central one is damaged to a significantly weaker extent. Surface degradation increases as the number of pulses increases. Laser irradiation is revealed to change the X-ray diffraction (XRD) patterns: loss of texture, presence of vanadium-oxide signal, peak broadening, and lattice parameter increase (from 3.022(2) to 3.027(3) A). It is shown that preliminary irradiation with argon ions (dose of 1022 m–2, E = 20 keV) affects no surface damage of the central region, while in the adjacent heat-affected zone, there is a spallation of local surface regions.
Databáze: OpenAIRE
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