CHAPTER 3 - STRUCTURES OF METALS & CERAMICS | Crystal Structure

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Chapter 3: Structures of Metals & Ceramics ISSUES TO ADDRESS... ã How do atoms assemble into solid structures? ã How does the density of a material depend on its structure? ã How do the crystal structures of ceramic materials differ from those for metals? ã When do material properties vary with the sample (i.e., part) orientation? Chapter 3 - 1 Energy and Packing ã Non dense, random packing Energy typical neighbor bond length typical neighbor bond energy ã Dense, ordered packing r Energy
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  Chapter 3 -1 ISSUES TO ADDRESS... ã How do atoms assemble into solid structures?ã How does the density of a material depend on its structure?ã When do material properties vary with the sample (i.e. part! orientation? Chapter 3 #tructures of $etals % Ceramics ã How do the crystal structures of ceramic materials differ from those for metals?  Chapter 3 -& ã 'on dense random pacin)ã *ense ordered pacin)*ense ordered paced structures tend to have lower ener)ies. +ner)y and ,acin) Energy r  typical nei)hbor    bond len)th   typical nei)hbor    bond ener)y   Energy   r  typical nei)hbor    bond len)th   typical nei)hbor    bond ener)y    Chapter 3 -3 ã atoms pac in periodic 3* arraysCrystalline materials...-metals-many ceramics-some polymersã atoms have no periodic pacin)'oncrystalline materials...-comple structures-rapid coolin) crystalline #i & noncrystalline #i & / 0morphous/  'oncrystalline  0dapted from 2i). 3.4(b!  Callister & Rethwisch 3e.   0dapted from 2i). 3.4(a!  Callister & Rethwisch 3e.   $aterials and ,acin) SiOxygen ã typical of ã occurs for   Chapter 3 -  $etallic Crystal #tructures ãHow can we stac metal atoms to minimi5e empty space?&-dimensions vs. 'ow stac these &-* layers to mae 3-* structures
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