Final_Review

Final_Review - Course Evaluation www.odu.edu Current...

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1 Course Evaluation www.odu.edu Æ Current Students Æ Course Evaluation System (under Academic Resources) ME 201: Materials Science, Z. Hao 1 Final Exam Time: Dec. 14, Friday, 3:45PM-6:45PM Place: KH 100 Weight: 35% ME 201: Materials Science, Z. Hao 2 Content: the whole book, but Chapters. 12~14 account for 70%
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2 What have we learned? ± Atomic structure: Electron structure + atomic bonds ± Crystal structure: BCC, FCC, HCP ± Five types of materials Five types of materials: Metals & alloys: Metallic bonds, crystalline, Polymers: Covalent bonds, Noncrystalline Ceramics: Covalent + Ionic bonds, Crystalline Composites: Enhancement + Matrix Semiconductors: Covalent bonds, crystalline ME 201: Materials Science, Z. Hao 3 ± Four Processes: Solidification, thermal diffusion, Phase diagrams, Corrosion ± Mechanical properties: Tensile strength, stress, strain, fracture toughness, failure . .. Atomic Structure ± The structure of atoms: nucleus + electrons ± Electronic structure of atoms: Atomic Structure & Bonding Electronic structure of atoms: principal shells, orbitals, energy levels Atomic and Molecular Bonds ± Primary bonds: covalent, ionic, metallic ± Secondary Bonds: Permanent dipole, fluctuating dipole ME 201: Materials Science, Z. Hao 4
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3 Three metallic crystal structures: BCC, FCC, HCP Crystal Structures & Geometries (1) BCC FCC HCP ± Coordinate number 8 12 12 ± APF 0.68 0.74 0.74 ± Lattice constant a c/a=1.633 (ideal) ± Basic Unit cell cubic cubic hexagonal ± Variations body-centered face-centered close-packed 2 4 R 3 4 R ME 201: Materials Science, Z. Hao 5 5 ± Atomic position : location of an atom in cubic unit cell ± Direction indices : vector direction in cubic unit cells Crystal Structures & Geometries (2) ± Miller Indices : Crystallographic planes in cubic unit cells ME 201: Materials Science, Z. Hao 6 (0, 0, 0) (101) [111]
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4 ± Volume Density (mass/volume) v ρ Mass/Unit cell = Crystal Structures & Geometries (3) ± Plane Atomic Density
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This note was uploaded on 08/29/2008 for the course ME 201 taught by Professor Hao during the Spring '07 term at Old Dominion.

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Final_Review - Course Evaluation www.odu.edu Current...

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