Generolo Jono Žemaičio Lietuvos karo akademija

The article presents the results of the study of the effect of combined preload on the change of mechanical properties of the aluminum alloy 2024-T3 at room temperature. The disclosure changes in the mechanical properties of the alloy were explained during the analysis of the deformation process in the material at the micro level (material grain). Experimental studies of the deformation process and its implementation mechanism at the micro level were carried out using the thin foil method using a Hitachi STEM HD2700 transmission electron microscope. Electron microscopic examination of the foil revealed an inclusion of minor phase particles in the aluminum matrix, which create a noticeable contrast in the image - dark inclusions against the background of the light matrix. The change of the dislocation density after combined loading was also found, because the scalar density of the dislocation in the material is in this case lower than after the tensile test, despite the same residual plastic deformation of the samples.

The aim of this paper is to investigate the ballistic properties of laminates made of light alloys under various configuration and thickness. The laminates were obtained by explosive welding method. Composite components are aluminum alloy AA2519 and titanium alloy Ti6Al4V with the aluminum alloy AA1050 as intermediate layer. The paper describes the influence of the bullet impact energy on the structure of the panel, depending on the configuration of the laminates: thickness of the layers and the applicated heat treatment. Ballistic resistance tests were carried out in accordance with the standards STANAG 4569 Level 2. The results of the research were compared to the ballistic resistance of typical material used for ballistic shields production.