Kinetics of the microstructure of targets from FCC alloys under high-strain-rate deformation


The protection of various objects experiencing shock loads from the impact of irregularly shaped impactors with impact velocities over 1.5-2.0 km/s is of considerable interest and is relevant. Computer modeling of the processes of high-speed interaction of impactors with various objects in order to create optimal designs requires deep knowledge of the physical and mechanical properties and processes occurring in the thickness of at least the material of the barrier (object). However, the existing technical measuring instruments make it possible to register only the kinematic parameters of the deformation and destruction of the barrier and impactor, while the development of internal processes remains inaccessible for visualization. In addition, the physical processes of high-speed deformation and destruction occurring in obstacles are highly dependent on the many contact boundaries that are inherent in irregularly shaped strikers, and in computer modeling and experimental studies, strikers, as a rule, have the correct geometric shape (cylinder, sphere). As a result, there is a significant loss of calculation accuracy. The article is devoted to the analysis of the behavior of various FCC metals – aluminum alloys, stainless steel, and aluminum bronze under impact loading by irregularly shaped projectiles with velocities of 1.5-2.0 km/s. Transformations of the deformed state of materials are revealed and it is shown that they depend little on the initial structure.