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Ch_4_Defects_in_Solids_1_Compatibility_Mode_(2)

Ch_4_Defects_in_Solids_1_Compatibility_Mode_(2) -...

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1 INTRODUCTION TO MATERIALS SCIENCE PSMMY January2010 1 Previously… Previously, we looked at perfection in atomic arrangement. PSMMY January2010 2 TODAY… n Imperfections in atomic arrangements PSMMY January2010 3 What is it all about? Learning Outcomes Today… what do I want you to learn? To identify and explain the defects present in crystalline materials. PSMMY January2010 4 To calculate the equilibrium number of vacancies in a material at some specified temperature. Describe the significance of point and line defects in solids. Learning Outcomes Today… what do I want you to learn? For each of edge and screw dislocation: Describe and make a drawing of the dislocation, PSMMY January2010 5 Note the location of the dislocation line, and Indicate the direction along which the dislocation line extends. Describe the atomic structure within the vicinity of a grain boundary and a twin boundary. PSMMY January2010 6
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