화학공학소재연구정보센터
Applied Surface Science, Vol.255, No.5, 1712-1718, 2008
Formation of surface periodic microstructure at laser irradiation of the multilayer Ni/Cu/Cr system
The effect of periodic pulsed laser irradiation (lambda = 1.06 mm and power density of 0.6-0.8 x 10(4) W/cm(2)) on the solid-phase reaction in thin-film Ni/Cu/Cr 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 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 sign-variable temperature gradient (similar to 105 K/ s), high deformation rate (similar to 20 s (1)), and large dislocation flow (rho v similar to 10(11) cm(-1) s(-1)) at low deformation degree (similar to 0.01). (C) 2008 Elsevier B. V. All rights reserved.