Which of the following defines a plane that is parallel to the z-axis?
2. Open Ended
30 seconds
1 pt
Which of the following would be good examples of single crystals?
3. Open Ended
30 seconds
1 pt
In cubic systems, planes and directions with the same indices are:
4. Open Ended
30 seconds
1 pt
The coordination number for the face-centered cubic cell is:
5. Open Ended
30 seconds
1 pt
The relationship between the lattice parameter and the atomic radii in the body-centered cubic cell is:
6. Open Ended
30 seconds
1 pt
Which of the following defines a direction along the x-axis?
7. Open Ended
30 seconds
1 pt
In the BCC system, in which plane do the atoms touch their neighbors?
8. Open Ended
30 seconds
1 pt
The body-centered cubic cell has atoms:
9. Open Ended
30 seconds
1 pt
The face-centered cubic cell has atoms:
10. Open Ended
30 seconds
1 pt
The atomic packing factor is the same for hexagonal close-packed and the face-centered cubic crystal structures. T or F?
11. Open Ended
30 seconds
1 pt
Substances in which measured properties are independent of the direction of measurement are:
12. Open Ended
30 seconds
1 pt
The stacking sequence of closed packed planes in FCC is:
13. Open Ended
30 seconds
1 pt
In polycrystalline materials, the area where two differently oriented crystals meet is called:
14. Open Ended
30 seconds
1 pt
In the BCC crystal structure atoms touch along which direction?
15. Open Ended
30 seconds
1 pt
What is the difference between atomic structure and crystal structure? Atomic structure relates to the:
16. Open Ended
30 seconds
1 pt
What is the difference between atomic structure and crystal structure? Crystal structure relates to the:
17. Open Ended
30 seconds
1 pt
Imagine that a single element exists in the 3 different crystal structures shown below. Which crystal structure has the largest lattice parameter?
18. Open Ended
30 seconds
1 pt
You 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 Ended
30 seconds
1 pt
Both 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 Ended
30 seconds
1 pt
Between SC and BCC structures, which as more atoms per unit cell?
21. Open Ended
30 seconds
1 pt
What is the coordination number of the BCC structure?
22. Open Ended
30 seconds
1 pt
Nickel 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 Ended
30 seconds
1 pt
Imagine that a single element exists in 3 different crystal structures. What is the relationship of the lattice parameter between the crystal structures?
24. Open Ended
30 seconds
1 pt
Two 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 Ended
30 seconds
1 pt
Imagine that a single element exists in the 3 different crystal structures. What is the relationship of the APF between the crystal structures?
26. Open Ended
30 seconds
1 pt
A 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 Ended
30 seconds
1 pt
Both 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 Ended
30 seconds
1 pt
Imagine 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 Ended
30 seconds
1 pt
Sodium 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 Ended
30 seconds
1 pt
Imagine that a single element exists in 3 different crystal structures. What is the relationship of density between the crystal structure?
31. Open Ended
30 seconds
1 pt
A polymorphic (allotropic) material has two possible crystal structures: SC and BCC. Which crystal structure has a higher density?
32. Open Ended
30 seconds
1 pt
A 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 Ended
30 seconds
1 pt
What is the planar densities for the (011) plane in the FCC structure?
34. Open Ended
30 seconds
1 pt
Iron 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 Ended
30 seconds
1 pt
Which of the following directions is not close packed for a given crystal structure?
36. Open Ended
30 seconds
1 pt
Closed packed planes occur in the following crystal structure: