In this work, the influence of the material structure (coarse- and fine-grained) on the formation of pores under static loading at room temperature as a structural change during deformation is studied. To improve the properties of metallic materials, the methods of thermal hardening and aging, as well as the methods of severe plastic deformation (SPD), are used. These methods are interesting due to the profound change in the structure, physical and mechanical properties, and phase composition. To evaluate the impact of these methods of material processing, modern researchers are studying the application of various types of loading, further processing, as well as the study of changes in the
surface and internal structure of objects obtained using these methods. Previously, it was proved that with a decrease in the grain size, the pore sizes of the material, formed during static tension at room temperature, decrease: the coarse-grained state corresponds to pores with a size of 3–7 μm, and for the ultrafine-grained state, 1–2 μm. In this paper, this study is supplemented by a new result: the type of heat treatment of coarse-grained material (natural aging) entails the formation of pores throughout the entire loading area of ​​the material, in contrast to artificially aged coarse-grained material or material with an ultrafine-grained structure, where the pores are located near the fracture area.