The Study of Multi-Scale Plastic Deformation Characteristics in Aluminum

The paper considers the regularities of processes of microscopic localization of polycrystalline aluminum plastic flow under uniaxial tension at room temperature. Fields of local deformations are investigated using the double-exposure speckle photography technique. Variations in velocities of ultrasound waves in flat samples under loading are recorded with the autocirculation method. The parameters of local deformation distributions and Rayleigh waves were found to be dependent on the level of total deformation. The variation in dislocation density during plastic deformation was estimated. There is a linear correlation found between the values of applied external stresses and internal stresses, calculated using the Taylor strain hardening model. The acoustic wave parameters obtained during the study help estimate the microstructural characteristics of metals deformed under quasi-static loading. It is shown that the dependences of Rayleigh wave propagation velocities can be used to calculate deformation kinetics within the scope of the autowave model of plastic flow.