Specific Features of Electroplastic Effect in Mono- and Polycrystalline Aluminum

The deformation behavior of mono- and polycrystalline aluminum under tension with the impact of different modes of current has been studied. It is shown that the deformation behavior of a monocrystal under the impact of single current pulses is characterized by hardening, and that of a polycrystal is characterized by softening, with an increase in the relative elongation to fracture in both materials. The deformation mechanism depends on the current regime and microstructure. The relative contribution of the electroplastic effect to the decrease in flow stresses is higher than that of the thermal effect of the current.