MSE2001H_5_2 - 1 Chapter 5 Linear, Planar, and Volume...

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1 Chapter 5 Linear, Planar, and Volume Defects • Introduction • Linear Defects, Slip and Plastic Deformation • Planar Defects • Volume Defects • Strengthening in Metals
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2 Creation of an Edge Dislocation in Ionic Crystal Inserting a single half plane of ions Inserting a double half plane of ions Violates alternate charge Alternate charges satisfied
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3 Deformation in NiO Except for a specific slip direction, most of the slip direction make unstable charge-charge repulsion. Æ Structure would be broken easily and brittlely.
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4 Planar Defects Free surface (external surface): a type of defect Ledge, o r s t e p on he u f a c Vacant site Repeatable step Add atom Change in energy of a free surface with the addition of an atom Why? Surface energy : the extra energy associated with the free surface P T A G , = γ Surface tension : Free energy change as a function of surface area Q) If you add one atom, which place would be good to reduce the energy of the surface?
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This note was uploaded on 06/29/2009 for the course MSE 2001 taught by Professor Tannebaum during the Spring '08 term at Georgia Institute of Technology.

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MSE2001H_5_2 - 1 Chapter 5 Linear, Planar, and Volume...

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