Materials with quasi-crystalline phases, including Al-Cu-Co single quasicrystals, belong to a modern generation of functional and constructional materials with unique physical properties. They can be used in automobile, aircraft and space industry. In this work the growth morphology of one- and two-subgrain Al-Cu-Co single quasicrystals was studied. The single quasicrystals were obtained by the modification of inclined front crystallisation (IFC) method, which enabled the determination of some morphological traits of solidification front and the relation between these traits and parameters of the growth process. This method was chosen because in the case of Bridgman or Czochralski methods, when the solidification front is perpendicular to the solidification direction, single quasi-crystals may be obtained at much lower solidification rates than for single crystals. At high solidification rates the diffusion cannot supply an appropriate quantity of cobalt necessary for single quasi-crystal growth along the entire solidification front. On the basis of relation between traits and parameters of the growth process the IFC method was suggested to determine thermal undercooling of the front solidification of quasicrystal growing from the molten phase and its dependence on the growth rate. The mechanism of growth of Al-Cu-Co single quasicrystals has been found to change at the growth rate of around 0.25 mm/min. Obtained samples have been subjected to metallography observation, X ray powder diffraction and Laue diffraction. The subgrain of the mosaic of the single quasi-crystals was examined by X-ray topography oscillation method (modification of the Auleytner method).

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