Study of the Influence of Impurity and Lattice Friction on the Expansion Dynamics of Dislocation Loops in FCC Metals

Abstract

The article presents the study on the influence of lattice and impurity friction on the expansion dynamic of dislocation loops emitted by Frank-Reid source, in nickel, copper, aluminum, and lead. A mathematical model written under the assumption that a dislocation loop expands in a homogeneous isotropic medium and is in the shape of a circle is used to carry out the study. The studies on the influence of lattice and impurity friction on the width of a dislocation cluster, the radius of the crystallographic shear zone, the number of dislocations in a dislocation cluster, and the maximum value of the velocity of the first emitted dislocation loop is carried out, and their linear relationship is shown. It is established that the maximum velocity and the path of the last emitted dislocation depend insignificantly on lattice and impurity friction, and the path of the last dislocation also depends insignificantly on metal.