The Effect of Pulse Current on Microstructure and Mechanical Property of the Pure Aluminum

Abstract

The tensile experiments were carried out under the condition of different pulse current on pure aluminum to analyze the effect of pulse current on the mechanical property such as tensile strength and elongation on material. The results show that pulse current could improve the mechanical properties and with pulse current the elongation of the aluminum increased to 19.5% and its tensile strength drops to some extent with the increase of electricity. At the same time, the dislocation structure features under different current density are also different. Without pulse current, dislocation is distributed as group unevenly. But when the current density J=8×102A/cm2, dislocation morphology changed into a mass of dislocation cells and moved to the grain boundary. Part of the cell walls formed grain boundary and then small angle subgrain formed. With the increase of current density, dislocation walls are arranged neatly and parallel to each other and at last single dislocation wall will be split into two or more parallel dislocation walls and form structure of striped band.