Dislocations are generated by deforming a crystalline material such as metals, which can cause them to initiate from surfaces, particularly at stress concentrations or within the material at defects and grain boundaries.

Dislocations allow deformation at much lower stress than in a perfect crystal because slip does not require all bonds across the slip line to break simultaneously, but only small fraction of the bonds are broken at any given time.

Dislocations have proved quite versatile in accounting for many aspects of the mechanical behavior of metals. By the same token, the theory has been criticized as being somewhat too flexible in its ability to fit the facts.

Jul 19, 2024 · In materials science, dislocations are line defects that exist in metals. A dislocation is a crystallographic defect or irregularity within a crystal structure. The presence of dislocations strongly influences many properties of materials.

Dislocations are defined as the irregularities in the structure of metals. These arise from misplacement of bonds of the atoms in a part of the plane of a crystal and are considered to be weak centres. They are instrumental in affecting the breaking stress and plastic and chemical properties of crystals.

In materials science, a dislocation is a crystallographic defect or irregularity, within a crystal structure. The presence of dislocations strongly influences many of the properties of materials. The theory was originally developed by Vito Volterra in 1905.

Dislocation Motion Dislocations & plastic deformation • Cubic & hexagonal metals - plastic deformation by plastic shear or slip where one plane of atoms slides over adjacent plane by defect motion (dislocations). • If dislocations don't move, deformation doesn't occur! Adapted from Fig. 7.1, Callister 7e.

Oct 28, 2024 · Discover how dislocations in solids influence material properties, affecting strength, ductility, and performance in engineering applications and everyday materials.

Jan 1, 2024 · Dislocation is a line defect in crystal. The dislocation line is the boundary line between the area that experiences relative displacement on both sides of a geometric surface in the crystal and the other areas that do not experience relative displacement. It forms a closed loop line in the crystal or terminates at crystal surface.

Jan 5, 2018 · The present study proposes an accessible, cheap and accurate method to quantify the dislocation network in metals, based on tensile tests and widely accepted physical principles of dislocation behaviour.