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Week12-14_Imperfections_Presentationfinal

Week12-14_Imperfections_Presentationfinal - MEMS1054 Week...

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MEMS1054 Week 12-14 - Imperfections in Crystals / Ordered Media; Professor Jörg Wiezorek, PhD, Materials Science and Metallurgy, University of Cambridge, UK, 1994.
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Point, Line, Surface and Volume Defects/Imperfections
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Intrinsic… & Extrinsic…
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Here … N:=number of atoms N:= number of vacancies N+n:= number of sites Vacancies…
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Self-Interstitials
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Consider and compare possible POINT DEFECTS in the Cu-Au chemically ‘disordered solid solution’ and in the chemically ‘ordered solid solution’.
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Line Imperfections --- Dislocations … and related Surface Imperfections --- Planar/Stacking Faults and Low-Angle Grain Boundaries
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Dislocations and Grain Boundaries
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Definition of a Dislocation and the Defining Descriptors Line/Sense/Tangent Vector: Unit vector tangent to every point along dislocation line (not constant… changing sense/character/type of dislocation); Burgers Vector (Displacement Vector): Constant for all points along Dislocation, the dislocation; the defining property!
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