MSE2001H_5_1 - 1 Chapter 5 Linear, Planar, and Volume...

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Unformatted text preview: 1 Chapter 5 Linear, Planar, and Volume Defects • Introduction • Linear Defects, Slip and Plastic Deformation • Planar Defects • Volume Defects • Strengthening in Metals 2 Line Defect A one-dimensional (linear) region in the lattice characterized by local faults in the atomic arrangement Dislocations are line defects cause slip between crystal plane when they move produce permanent ( plastic ) deformation Slip? e.g.) Zn (HCP) 3 Slip 4 Shear Strength of Deformable Single Crystal Normal Force Shear Force Normal stress ( σ ) Stress in the direction parallel to the plane normal Shear stress ( τ ) Stress in the direction perpendicular to the plane normal Permanent displacement of atoms within a crystal Æ Plastic deformation Requirement? Sufficient magnitude of force (stress or pressure) 5 When the plastic deformation happens…. 1. It results from shear stresses . 2. Plastic deformation is anisotropic occurring on high-density planes and in close-packed direction . 3. For each crystalline material, there is a critical value of shear stress i) on the favored plane ii) in the favored direction at which plastic deformation will begin the favored plane Æ slip plane the favored direction Æ slip direction Slip Systems 6 τ = σ cos θ cos φ Extensive variable Intensive variable F s /A s = ( F / A )cos θ cos...
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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_1 - 1 Chapter 5 Linear, Planar, and Volume...

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