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Chapter 7 Slides

Chapter 7 Slides - Chapter 7 Lectures begin on R Mar 6 2008...

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Chapter 7 Chapter 7 Lectures begin on R Mar. 6, 2008
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2 Chapter 7 Chapter 7 Dislocations and Dislocations and Strengthening Mechanisms Strengthening Mechanisms
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3 Dislocations ( Dislocations ( Dn Dn ) in different classes of materials ) in different classes of materials • Covalent Ceramics (Si, diamond): Motion hard. -directional (angular) bonding • Ionic Ceramics (NaCl): Motion hard. -need to avoid ++ and - - neighbors. + + + + + + + + + + + - - - - - - - - - - • Metals: D n motion easier. -non-directional bonding -close-packed directions for slip. electron cloud ion cores + + + + + + + + + + + + + + + + + + + + + + + + Bond deformations are smaller in metals and displacement vector b is smaller – therefore slip is easier
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