Lecture07 - ME 382 Lecture 07 DEFECTS AND MICROSTRUCTURE...

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ME 382 Lecture 07 22/ix/10 1 D EFECTS AND M ICROSTRUCTURE Point, interfacial & line defects in crystals Any region where order of crystal is broken Control structure-sensitive properties Point defects Defects limited to isolated lattice sites Vacancies: Missing atoms from crystal lattice (regions of tension) Interstitials: Extra atoms squeezed into crystal lattice (compression) Lattice may locally distort around defect, resulting in a displacement of atoms from equilibrium position local regions of stress Vacancies tensile stresses Interstitials compressive stresses Interfacial defects Defects in a plane Grain boundaries: Disordered region between grains
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ME 382 Lecture 07 22/ix/10 2 Twin boundaries: Portions of lattice related to each other by simple rotation Net result of twinning is shear deformation Note that plastic deformation is a permanent shear deformation (occurs in response to shear stresses change of shape not volume)
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This note was uploaded on 01/26/2011 for the course ME 382 taught by Professor Garikipati during the Winter '08 term at University of Michigan.

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Lecture07 - ME 382 Lecture 07 DEFECTS AND MICROSTRUCTURE...

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