Features of Vanadium-Surface Damage Induced by Pulsed Laser Radiation

Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques. 2020. Vol. 14. No. 3. P. 484–489.

Borovitskaya I. V., Korshunov S. N., Mansurova A. N., Mikhailova A. B., Paramonova V. V., Bondarenko G.G., Gaidar A. I., Kazilin E. E.

The damage features of the vanadium surface layer under the action of pulsed laser radiation are investigated. Laser irradiation of the samples was carried out in air using the GOS 1001 installation in the modulated q-factor mode with a flux density q equal to 1.2 × 108 W / cm2, pulse duration τ0 = 50 ns, the number of pulses N from 1 to 6. It is shown that the typical surface damage is melting of the material, formation of the grid of microcracks, formation of wave-like relief and drip structures. The central zone is characterized by the highest degree of damage, where along with the above mentioned damage there are individual drops of metal that are crystallized like a spiral. The zone of thermal influence adjacent to the central zone of irradiation is damaged much weaker and the degradation of the surface increases with the increase in the number of laser pulses. As a result of laser processing, along with the change in the topography of the material surface, changes in the diffractograms of samples were also observed: the texture weakens, the peaks become wider, the lattice period increases (3.022 – before irradiation, 3.027 after irradiation). It was found that the preliminary argon ions (dose 1022 m-2, E = 20 keV) irradiation of samples practically does not affect the nature of surface damage in the central zone after laser treatment, whereas in the adjacent zone of thermal influence there is a break of local surface areas.

Keywords: топография поверхности, vanadium, ванадий, surface topography, pulsed laser irradiation, импульсное лазерное воздействие