A Pulsed Current Application to the Deformation Processing of Materials

Abstract

A review of studies on the electroplastic effect on the deformation process in various conductive materials and alloys for the last decade has been carried out. Aspects, such as the mode and regimes of electric current, the practical methods of its introduction into materials with different deformation schemes, features of deformation behavior accompanied by a pulsed current of different materials, structural changes caused by the combined action of deformation and current, the influence of structural features on the electroplastic effect, changes in the physical, mechanical, and technological properties of materials subjected to plastic deformation under current, possible mechanisms and methods of physical and computer modeling of the electroplastic effect, and potential and practical applications of the electroplastic effect are considered. The growing research interest in the manifestation of the electroplastic effect in such new modern materials as shape-memory alloys and ultrafine-grained and nanostructured alloys is shown. Various methods of modeling the mechanisms of electroplasticity, especially at the microlevel, are becoming the most realistic approach for the prediction of the deformation behavior and physical and mechanical properties of various materials. Original examples of the practical application of electropulse methods in the processes of drawing, microstamping, and others are given.

Effect of Repetitive High-Density Current Pulses on Plastic Deformation of Copper Wires under Stepwise Loading

“…To study the effect of electrical pulses on the plastic deformation of wires, an experimental setup was developed and assembled, see Figure 4. The wire sample (1) is mechanically loaded by a suspension (2) carrying loads of different masses (3). The strain of the sample is controlled by a dial micrometer (4).…”

“…As a result, energy costs for forming parts can be saved compared to traditional methods of processing materials by pressure. In recent years, research on EPE has become increasingly popular [3][4][5][6] since this effect has found applications in various industries. Due to the skin effect [7], a non-thermal reduction in flow stress can be observed in relatively thin workpieces in such manufacturing processes as drawing [8,9], rolling [10,11], stamping [12], forging [13,14], cutting [15], and forming [5,6,[16][17][18][19].…”