MCG 2360 Lecture Notes - Lecture 7: Frenkel Defect, Crystallographic Defect, Ion

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Defects and imperfections limit the mechanical properties of metals. These defects are a result of design or are procured during processing. Defects in ceramic structures vacancies of both cations and ions. Shottky defect: a paired set of cation and anion vacancies interstitials mostly cations. Frenkel defect: a cation is out of place. Line defects (dislocations): introduced during solidification or when the material is deformed permanently very useful in explaining the deformation and strengthening in metallic materials edge dislocation https://www. nde- ed. org/educationresource s/communitycollege/mat erials/structure/linear_de fects. htm. Burgers vector: plastic deformation direction the burgers vector of an edge dislocation is perpendicular to the. Lectures page 1 the burgers vector of an edge dislocation is perpendicular to the dislocation line. = positive edge dislocation, = negative edge dislocation screw dislocation. Burgers vector is the direction of the displacement of the atoms for a screw dislocation, b is parallel to the line of dislocation. = positive dislocation, = negative dislocation https://courses. eas. ualberta. ca/eas421/lecturepages/microstructures. html https://www. nde- ed. org/educationreso urces/communitycoll ege/materials/structur e/linear_defects. htm.

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