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mse07 - Chapter 7 Dislocations Strengthening Mechanisms...

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1 Chapter 7 - 1 ISSUES TO ADDRESS... Why are dislocations observed primarily in metals and alloys? How are strength and dislocation motion related? How do we increase strength? How can heating change strength and other properties? Chapter 7: Dislocations & Strengthening Mechanisms Chapter 7 - 2 Dislocations & Materials Classes • Covalent Ceramics (Si, diamond): Motion hard. -directional (angular) bonding • Ionic Ceramics (NaCl): Motion hard. -need to avoid ++ and - - neighbors. + + + + + + + + + + + - - - - - - - - - - • Metals: Disl. motion easier. -non-directional bonding -close-packed directions for slip. electron cloud ion cores + + + + + + + + + + + + + + + + + + + + + + + +
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