8242010 - c a=b≠c d Two angles equal 90 i One angle...

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1. Short Rance Order (SRO) a. Amorphous 2. Long Range Order (LRO) a. Crystalline 3. SiO 2 Can be both a. Quartz- Halogen- Amorphous Silicon Oxide 4. Metals that we use are almost always crystalline, that are a few exceptions. 5. Ceramics a. Essentially crystalline but glasses are amorphous 6. Polymers a. Theromosets= amorphous b. Thermoplastics- mixed (the degree of production changes the crystalline) 7. Structures (7 systems, must be space filling in a crystalline) a. Cubic b. Tetragonal c. Orthohombic d. Monoclimic e. Hexagonal f. Triclinic g. Rhombo Hedral 8. Cubic: a. 90 degrees = all angles b. a=b=c c. Most structural metals are cubic or hexagonal i. Cubics Include: 1. Iron
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2. Platinum 3. Allumina 4. Titanium d. Face Centered Cubic i. ABC,ABC,ABC structure ii. Atoms at (0,0,0), (½ , 0, ½), (½,½,0) and (0, ½, ½) iii. 74% Dense 1. Al, Pt, Pb, Si (some stainless steel) e. Body Centered Cubic (BCC) i. One atom at 0,0,0 position and one atom at ( ½ , ½ , ½ ) ii. Most Iron, Mo, Cr, W iii. 68% Dense by volume 9. Hexagonals a. Zinc, Magnesium, ect b. These are favored because you can deform them
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Unformatted text preview: c. a=b≠c d. Two angles equal 90 i. One angle equals 120 e. Hexagonal closed packed (HCP) i. Zn, Mg f. Cobalt is both Hexagonal and FCC 10. Ionic a. More than one atom tupe i. Changes on density models ii. Different Sizes iii. Change 1. Example: a. CsCl b. NaCl iv. Size ratio defines coordination numbers, and able to predict b. Polymers- Most polymers have a carbon backbone except Iron, Teflon, ect. The bigger thing you have the harder it is to handle. c. Polymers fold molecules into patterns. Polymers give ranges d. Elements: Allctophy e. Compouds: Polymorphisim f. When they undergo these changes then it also changes in volume 11. Imperfection a. Single Crystal i. Not too many of them used, but within it they are perfectly lined up ii. Polycrystal b. Point Defects i. Missing atoms vacancies control diffusion (atoms move in around with in a solid, Alloying (doping)....
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This note was uploaded on 06/28/2011 for the course MSE 280 taught by Professor Dr.barryandrews during the Fall '10 term at University of Alabama at Birmingham.

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8242010 - c a=b≠c d Two angles equal 90 i One angle...

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