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MCE 230_F10_ lec_14 -  Extra half-plane of atoms(or part...

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MCE 230 Materials Science Fall 2010 Lecture - 14
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Imperfections in Solids
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Composition (concentration) Weight percentage ( where m is the weight or mass of element) Atom percentage (where m’ is mass (grams) and A is the atomic weight)
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Composition Conversions
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Solved Problems 4.9
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Linear Defects (Dislocations) Some of the atoms are misaligned Types of dislocations: 1. Edge dislocation 2. Screw dislocation 3. Mixed dislocation
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Edge Dislocation
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Unformatted text preview:  Extra half-plane of atoms (or part of a plane) Screw Dislocation Mixed Dislocation Burgers Vector  A way to express the magnitude and direction of the distortion associated with a dislocation  Denoted by b  For edge: Burgers vectors are perpendicular to dislocation line  For screw: Burgers vectors are parallel to dislocation line http://en.wikipedia.or g/wiki/Image:Vector_d e_Burgers.PNG...
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