Question
Download Solution PDFWhich of the following is a line defect?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.
Dislocation: It is the boundary between slipped and unslipped portions of a crystal.
Edge dislocation: It is a linear defect that centers on the line that is defined along the end of the extra half-plane of atoms. There is distortion around the distortion line. Atoms above the plane are squeezed together and atoms below the plane are pulled apart.
Screw dislocation: In screw dislocation, the dislocations are formed as the shear stress is applied to produce the distortion. The upper front region of the crystal is shifted from one atomic distance to the right relative to the bottom portion. Dislocation lines are parallel to the applied shear stress.
Dislocation movement:
Edge dislocation moves || to the shear direction
Screw dislocation moves ⊥ to the shear direction
Classification of structural imperfection
|
Point Defect(0D) |
Line Defect(1D) |
Surface Defect (2D) |
Volume Defect(3D) |
|
Vacancies Self Interstitialcy Impurities
Frenkel Defect Schottky Defect
|
Edge Dislocation Screw Dislocation |
Grain boundaries Low angle boundaries
Twin boundaries Stacking Fault |
Casting defects Welding Defects Forming Defects |
Last updated on Jul 1, 2025
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