Formation of Surface Periodic Microstructures in Multilayer Films Cr/Cu/Ni under Laser Radiation

摘要

The effect of periodic pulsed laser irradiation (gamma=1.06 mu m and power density of (6-9) centre dot 10~3 W/cm~2) on the solid-phase reaction in thin-film Cr/Cu/Ni structure (each layer of 100 nm thick) is studied by means of Auger-electron spectroscopy and scanning electron microscopy. Thin-film structure is found to transform under irradiation into the eutectic Cr-Ni structure with the particles of the leading Cr(Ni) phase having the radii equal to the total thickness of the film (300 nm). Eutectic colonies of these particles form the surface microstructure, which consists of periodic arc-shaped bands with bars between them. The laser-induced diffusion is shown to occur under the varying-sing temperature gradient (approx 10~5 K/s), high deformation rate (approx 20 s~(-1)), and large dislocation flow (rho nu approx10~(11) cm~(-1) centre dot s~(-1)) at low deformation degree (approx 0,01).