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- 1. Open EndedWhich of the following defines a plane that is parallel to the z-axis?
- 2. Open EndedWhich of the following would be good examples of single crystals?
- 3. Open EndedIn cubic systems, planes and directions with the same indices are:
- 4. Open EndedThe coordination number for the face-centered cubic cell is:
- 5. Open EndedThe relationship between the lattice parameter and the atomic radii in the body-centered cubic cell is:
- 6. Open EndedWhich of the following defines a direction along the x-axis?
- 7. Open EndedIn the BCC system, in which plane do the atoms touch their neighbors?
- 8. Open EndedThe body-centered cubic cell has atoms:
- 9. Open EndedThe face-centered cubic cell has atoms:
- 10. Open EndedThe atomic packing factor is the same for hexagonal close-packed and the face-centered cubic crystal structures. T or F?
- 11. Open EndedSubstances in which measured properties are independent of the direction of measurement are:
- 12. Open EndedThe stacking sequence of closed packed planes in FCC is:
- 13. Open EndedIn polycrystalline materials, the area where two differently oriented crystals meet is called:
- 14. Open EndedIn the BCC crystal structure atoms touch along which direction?
- 15. Open EndedWhat is the difference between atomic structure and crystal structure? Atomic structure relates to the:
- 16. Open EndedWhat is the difference between atomic structure and crystal structure? Crystal structure relates to the:
- 17. Open EndedImagine that a single element exists in the 3 different crystal structures shown below. Which crystal structure has the largest lattice parameter?
- 18. Open EndedYou are investigating the atomic packing factor (APF) relationship between FCC aluminum and HCP zinc. Aluminum has a larger atomic radius than zinc, but aluminum also has a lower atomic weight. Both FCC and HCP are close-packed structures. Between FCC aluminum and HCP zinc, which one as higher APF?
- 19. Open EndedBoth iron and chromium have a BCC structure at room temperature. Iron's atomic weight is larger than chromium, but its atomic radius is smaller than chromium. Which element has a higher density for its BCC structure?
- 20. Open EndedBetween SC and BCC structures, which as more atoms per unit cell?
- 21. Open EndedWhat is the coordination number of the BCC structure?
- 22. Open EndedNickel and Palladium each form a close-packed FCC structure. The value of the atomic radius of each atom is approximately the same, but palladium has a much higher atomic weight. Which element has a larger lattice parameter for its FCC structure?
- 23. Open EndedImagine that a single element exists in 3 different crystal structures. What is the relationship of the lattice parameter between the crystal structures?
- 24. Open EndedTwo elements have different crystal structures: FCC and BCC. Both unit cells turn out to have equal volume. Which element has the larger atomic radius?
- 25. Open EndedImagine that a single element exists in the 3 different crystal structures. What is the relationship of the APF between the crystal structures?
- 26. Open EndedA polymorphic (allotropic) material (= materials with more than one crystal structure) has two possible crystal structures: FCC and BCC. Which crystal structure has higher APF?
- 27. Open EndedBoth iron and Chromium have a BCC structure at room temp. Iron's atomic weight is higher than chromium, but its atomic radius is smaller than chromium. Which element has higher APF for its BCC structure?
- 28. Open EndedImagine there are two large boxes that have the same dimension standing on top of a shaking platform. A student fills up the first box with wooden balls of equal size. The same student fills up the second box with hollow bronze balls of equal size. The bronze balls have a bigger radius but weigh less than the wooden balls. Which set of balls has higher APF?
- 29. Open EndedSodium and molybdenum each form a BCC structure. The size of the atomic radius of each atom is approximately the same at room temp, but sodium has a much lower atomic weight. Which element has a higher density for its BCC structure?
- 30. Open EndedImagine that a single element exists in 3 different crystal structures. What is the relationship of density between the crystal structure?
- 31. Open EndedA polymorphic (allotropic) material has two possible crystal structures: SC and BCC. Which crystal structure has a higher density?
- 32. Open EndedA duplex stainless steel solid cube is composed of 50% delta ferrite (BCC structure) and 50% austenite (FCC structure). Using a laser to melt and re-solidified the cube, the structure changes to a solid 100% delta ferrite BCC structure. How does the density change from the initial mixture to the final pure BCC structure? Assume there is no mass loss and the atomic radii are equal for all phases at all stages.
- 33. Open EndedWhat is the planar densities for the (011) plane in the FCC structure?
- 34. Open EndedIron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85g/mol. Compute its theoretical density and compare with its experimental density, which is7.87 g/cm3. Which one is higher?
- 35. Open EndedWhich of the following directions is not close packed for a given crystal structure?
- 36. Open EndedClosed packed planes occur in the following crystal structure:
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