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Titanium grade 5 (Ti6Al4V) is a modern material that can be found in a wide spectrum of applications, from medicine to aircraft industry. The commercial alloy is a mix of a body centered cubic structure (BCCA2) and a hexagonal closed packed structure (HCPA3). It is obvious, that heat treatment of the alloy will change a ratio between BCCA2 and HCPA3 and, as a consequence, properties of a material. Information about mobility of atoms in both crystal structures allows simulations and predictions of structures ' behavior during the heat treatment and diffusion. In this work the atomic mobility in liquid, BCCA2, and HCPA3 phases of ternary alloy Al - Ti - V were obtained based on available literature information. Comparison between simulations and experiments shows a good agreement, hence it can be concluded that proposed set of kinetic parameters can be used for predictions and simulations of Titanium grade 5 heat treatment. [ABSTRACT FROM AUTHOR]