MECHANICAL PROPERTIES OF SUBMICROCRYSTALLINE ALUMINIUM MATRIX COMPOSITES REINFORCED BY “IN SITU” GRAPHENE THROUGH SEVERE PLASTIC DEFORMATION PROCESSES

Abstract The method of high-resolution scanning and transmission electron microscopy was used to investigate the features of the formation of the structure and deformation behavior of a composite material based on aluminum with microadditions of graphene under severe plastic deformation by the dynamic channel-angular pressing method. It was found that an aluminum-graphene composite with a submicrocrystalline structure with the hardness 2.5 times higher than in the as-cast state forms in the deformation process. For the first time, the dynamic properties of the composite were measured under loading by plane shock waves at a speed of 5.0 · 105s-1. Comparison with the dynamic characteristics of a coarse-crystalline composite showed an increase in the dynamic elastic limit and dynamic yield stress by 1.8–2.0 times.