The study on the effect of the dislocation density on formation of a closed piecewise-continuous dislocation loop in aluminum

Mathematical model allowing carrying out studies on energy, scale and time characteristics of formation of closed dislocation loop and crystallographic shear zone as a whole, and forming of a dislocation loop for FCC-materials, has been developed. Using the mathematical model study on the effect of the dislocation density on the dynamics of formation of an elementary crystallographic slip bounded by a closed piecewise-continuous dislocation loop in aluminum has been carried out. It has been shown that with decrease in the density of dislocations in metal from 10(-12) up to 4.10(-11) along different orientations of the expansion of the dislocation loop the maximum value of the dislocation velocity increases by 20-30% and the maximum value of the kinetic energy and the dislocation path increases by almost 2 times. It has been shown that in aluminum the area of elementary crystallographic slip, swept out by the dislocation loop, increases with a decrease in the dislocation density in metal. But, at the same time, regardless of the value of the dislocation density in metal the radius of the dislocation loop in the final configuration along the screw orientation is practically by an order of magnitude less than along the edge orientation.