2011 APS104-MSE-Chapter05-NPK-L27[1].pdf

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Chapter 5 -
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Chapter 5 -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?
CHAPTER 5:
IMPERFECTIONS IN SOLIDS
•Reading: pp128 136, 140-147
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Chapter 5 -3
Solidification- result of casting of molten material
2 steps
Nuclei form
Nuclei grow to form crystals grain structure
Start with a molten material all liquid
Imperfections in Solids
Crystals grow until they meet each other
Adapted from Fig. 5.19 (b), Callister & Rethwisch 3e.
grain structure
crystals growing
nuclei liquid
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