In the course of homogenizing annealing of aluminium alloys being cast continually or semi-continually it appears that chemical
inhomogenity takes off within separate dendritic cells (crystal segregation). It is about a diffusion process that takes place at the
temperature which approaches the liquid temperature of the material. In that process the transition of soluble intermetallic compounds and
eutectic to solid solution occurs and it suppresses crystal segregation significantly [1]. The temperature, homogenization time, the size of
dendritic cells and diffusion length influences homogenizing process. The article explores the optimization of homogenizing process in
terms of its time and homogenizing annealing temperature which influence mechanical properties of AlZn5,5Mg2,5Cu1,5 alloy.