TA6V alloy belong to a group of materials applied in aircraft industry. Various methods of surface treatment are used to improve corrosion and wear resistance of these alloys. Hybrid method allows to obtain Ti-Al intermetallic layers on the surface of TA6V alloy. These layers are characterized by high microhardness and improved wear resistance.

Nevertheless, surface treatment influences not only on the chemical and phase composition of the layers but also the microstructure of the substrate. Phase transformations taking place during surface treatment have an effect on the microstructure homogeneity and phase composition of TA6V alloy. The microstructure changes can influence the mechanical properties such as fatigue resistance of surface treatment elements of TA6V alloy.

The aim of the investigation was to analyze changes in the morphology and phase composition of TA6V alloy after surface treatment by hybrid method. Hybrid method consisted of two stages. In the first stage, the titanium alloy was covered aluminum layer. In the second stage, coated specimens were treated under glow discharge conditions. The investigation focused on phase transformations occurring as a result of different parameters of surface treatments. The structure of layers and substrate microstructure were examined on a light and scanning electron microscope with Energy Dispersive Spectrometer (EDS). The phases fraction was defined using stereological method and XRD analysis. The surface topography was investigated using a profilometer.

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