Ch4part3 - 10/12/11 Reading: ANNOUNCEMENTS - 1 Ch. 4. All...

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10/12/11 1 Chapter 4 - 3 8 ANNOUNCEMENTS - 1 Reading: Ch. 4. All sections, except 4.11 Week 4 Recitations: No Quiz, Midterm #1 Problems 4.1, 4.5, 4.20, 4.23 and 4.24 Chapter 4 - 3 9 ± Structure: close-packed planes & directions preferred: Slip system = a slip direction and a slip plane view onto two close-packed planes close-packed plane (bottom) close-packed plane (top) close-packed directions ± Comparison between crystal structures: FCC : many close-packed planes/directions HCP : only one plane, 3 directions BCC : none - (111) is not a true close-packed plane Specimens that were tensile tested Mg (HCP) Al (FCC) tensile direction
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2 Chapter 4 - 4 0 K Solidification: Result of casting of molten material 2 steps: K Nuclei form K Nuclei grow to form separate crystals (crystallites) – grain structure K Start with a molten material all liquid Imperfections in Solids Adapted from Fig. 4.14 (b), Callister & Rethwisch 8e. K Crystals grow until they meet each other interfaces with atomic scale misalignments Nuclei Crystals growing Grain structure liquid Chapter 4 - 4 1 Polycrystalline Materials Grain Boundaries: interfaces between crystals transition from lattice of one region to that of the other slightly disordered lower density at grain
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Ch4part3 - 10/12/11 Reading: ANNOUNCEMENTS - 1 Ch. 4. All...

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