1M03 Crib Sheet - 1st Midterm

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Materials Science and Engineering
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Vanessa Raponi – 1M03 Crib Sheet Chapter 2 Chapter 3 Crystalline: atoms arranged into a periodic array; structure Non-Crystalline/Amorphous: “without form”, glassy, no long- range systematic or regular atomic structure. No ordered **where attract is +ve and repel is –ve...ALWAYS ** arrangement over a long distance. **when F Netis zero, bond length is found** Allotropy/Polymorphism: going from one structure to another. **Only occurs in crystalline materials!** Polycrystalline: “grains”, multiple crystal structures Grain Boundary: region where atomic mismatch overlaps Anisotropy: direction of crystallography **as structural **ensure abs value, ‘r’ in m** symmetry decreases, anisotropy increases** Isotropy: property independent of direction Crystalline Amorphous Mixed **High bonding NRG -> High melting temp** Metals Usually Rarely Never Primary Bonds: Ceramics Often Often Often 1. Ionic: Formed between a metal cation and a NM anion. Polymers Never Usually Sometimes Thermally and electrically insulated; hard; brittle; NOT ductile. (ie. NaCl, KBr) 2. Covalent: Shared e pairs. NOT the only form of bonding in polymers (ie. Diamond) 3. Metallic: Good heat and electric conductors (ie. Al, Ti, all metals), tends to form close-packed structures (crystals) Secondary Bonds: Hydrogen (NOF), Van der Waals (LD) and Dipole **From weakest to strongest: Van der Waals, dipole, hydrogen, metallic, covalent, ionic** FCC: ABCABCA…close-packed sequence HCP: ABABABAB…close-packed sequence 2 3 **volume for HCP is (3sin60)∙(4R )∙(1.63(2R)) in place of a ** **FCC has higher density than BCC** Miller Indices: NO FRACTIONS!! Multiply by a scalar for lines. With planes, just look at intercepts, reciprocals, reductions (if no intercepts,∞ which is equivalently 0) ** ** **'Interplanar spacing is d and lattice **Bond length corresponds to x-intercept of Force graph, parameter is a** Bond NRG corresponds to y-value of lowest point on NRG **n=1, 𝜃is sometimes 𝜃/2, in these Qs use this a, not a from chart** graph** Ch
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