201 Final Overview Posted

201 Final Overview Posted - Materials Science &...

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1 Materials Science & Engineering Paradigm Properties Structure/ Composition Performance Processing/ Synthesis
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2 Carbon: A Multitude of Structures • Properties of a material depend on its structure graphite diamond carbon nanotube C60 buckyball
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Interatomic Bonding • Ionic • Covalent • Metallic • Secondary 3 Distance Potential energy Binding/ cohesive energy Equilibrium separation asymmetric electron clouds + - + - secondary bonding H H H H H 2 H 2 secondary bonding ex: liquid H 2 secondary bonding
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Chapter 3 - 4 atoms pack in periodic, 3D arrays - BCC, FCC, HCP Crystalline materials. .. -metals -many ceramics -some polymers atoms have no periodic packing Noncrystalline materials. .. -complex structures -rapid cooling crystalline SiO 2 noncrystalline SiO 2 " Amorphous " = Noncrystalline Adapted from Fig. 3.22(b), Callister 7e. Adapted from Fig. 3.22(a), Callister 7e. Materials and Packing Si Oxygen typical of: occurs for:
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Chapter 3 - 5 Single Crystals -Properties vary with direction: anisotropic . -Example: the modulus of elasticity (E) in BCC iron: Polycrystals -Properties may/may not vary with direction. -If grains are randomly oriented: isotropic . (E poly iron = 210 GPa) -If grains are textured , anisotropic. 200 μ m Data from Table 3.3, Callister 7e . (Source of data is R.W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials , 3rd ed., John Wiley and Sons, 1989.) Adapted from Fig. 4.14(b), Callister 7e . (Fig. 4.14(b) is courtesy of
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This note was uploaded on 11/21/2011 for the course MAT SCI 201 taught by Professor Matsci during the Spring '10 term at Northwestern.

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201 Final Overview Posted - Materials Science &...

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