The resistance which a crystal lattice offers to a gliding dislocation in the absence of other imperfections and impurities depends on the width of the dislocation. In a positive edge dislocation, the atoms above and below the slip plane, in the vicinity of the dislocation lines are displaced from their equilibrium positions of the perfect lattice. The extent of the [...]
in this article we will discuss about:- 1. Geometry of the Edge Dislocations in Crystals 2. Motion of an Edge Dislocation of Crystals 3. Screw Dislocation in Crystals. Geometry of the Edge Dislocations in Crystals: Suppose, we have a simple cubic perfect crystal (we are taking this crystal structure for better clarity, though Polonium is the only metal having this [...]
In this article we will discuss about:- 1. Theory of Dislocations 2. Role and Significance of Dislocations 3. Characteristics 4. Properties. Theory of Dislocations: 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. [...]