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Explore methods of electron and atomic - force microscopy, X-ray analysis and optical profilometry, the microstructure of the surface oxidized duralumin after exposure to an area of ~ 100 cm2 powerful CO2 laser pulse (E ~ 500 J, τ = 5 μs, at the head of ~ 200 ns) . A layer of Al2O3, having a thickness of ~ 7 μm as a result of nonequilibrium heating up to T evaporation modified to form a polycrystalline conglomerate of several stoichiometric and non-stoichiometric phases alumina and compounds of manganese Mn and magnesium Mg.