4-IMPERFECTIONS-CHPT 4-MIAE 221-2023

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Oct 30, 2023

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1 IMPERFECTIONS IN SOLIDS Chapter 4 MIAE 221 – Materials Science
Notes# 4A - MIAE 221 (adapted from Callister) 2 ISSUES TO ADDRESS... What types of defects arise in solids? Can the number and type of defects be varied and controlled? How do defects affect material properties? Are defects undesirable? CHP 4: IMPERFECTIONS IN SOLIDS
Notes# 4A - MIAE 221 (adapted from Callister) 3 • Solidification - result of casting of molten material – 2 steps Nuclei of solid phase start to form Nuclei grow to form crystals – when crystal boundaries meet form grain structure Start with a molten material – all liquid Imperfections in Solids nuclei crystals growing grain structure liquid
4 Imperfections in Solids There is no such thing as a perfect crystal. Crystalline imperfections (or defects) are always present. Many of the properties of materials are sensitive to the presence of imperfections. Crystalline defect refers to a lattice irregularity with dimensions on the order of an atomic diameter. What kinds of crystalline imperfections exist in solids? Notes# 4A - MIAE 221 (adapted from Callister)
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