The purpose of this work is to obtain information on the behaviour of the deposits of aluminium alloys depending on the time and temperature of annealing, and their effect on the mechanical properties. The cycle of tests carried out made it possible to determine the conditions for the formation of precipitation, however, in practice, the results are influenced by external factors such as the geometry of the samples, the conditions of their heating and cooling. Therefore, results of tests conducted in accordance with the requirements of the European standards (DIN), can be improved by conducting preliminary tests. The increase in the hardness of these alloys occurs due to dispersed solidification of deposits, and the maximum hardness is achieved with partially coherent deposits. The conducted SEM studies show that the hardness of the prototypes of the AlSiMg alloy depends on the temperature and time of annealing. After quenching, with an increase in the annealing time, the hardness grows until the moment of formation of partially coherent precipitates and the maximum hardness is achieved. During metallographic studies, the fracture surfaces are macro- and microscopically examined using a stereomicroscope and a scanning electron microscope. Due to comparison of the surface of fractures at different modes of heat treatment, it can be argued that the samples with the maximum hardness are characterized by a brittle fracture. The use of photogrammetric methods in SEM studies and EDX-analysis of fracture specimens permit to orient with high accuracy an investigated plane in space and promote to obtain a high quality and reliable result. In order to confirm the optimal conditions of heat treatment, it is recommended to carry out further mechanical and metallographic studies based on the results of preliminary tests.