Week12-14_Imperfections_Presentationfinal

Week12-14_Imperfections_Presentationfinal - MEMS1054 Week...

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Unformatted text preview: MEMS1054 Week 12-14 - Imperfections in Crystals / Ordered Media; Professor Jörg Wiezorek, PhD, Materials Science and Metallurgy, University of Cambridge, UK, 1994. Point, Line, Surface and Volume Defects/Imperfections Intrinsic… & Extrinsic… Here … N:=number of atoms N:= number of vacancies N+n:= number of sites Vacancies… Self-Interstitials Consider and compare possible POINT DEFECTS in the Cu-Au chemically ‘disordered solid solution’ and in the chemically ‘ordered solid solution’. Line Imperfections --- Dislocations … and related Surface Imperfections --- Planar/Stacking Faults and Low-Angle Grain Boundaries Dislocations and Grain Boundaries 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! Dislocation, the dislocation; the defining property!...
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This note was uploaded on 01/07/2011 for the course MEMS Mems1054 taught by Professor Wiezorek during the Fall '10 term at Pittsburgh.

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Week12-14_Imperfections_Presentationfinal - MEMS1054 Week...

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