MSE250 Exam 2

Crystal plane orientations in a unit-cell can affect __ and __.

d. crystal growth; metal deformation

When indexing or drawing crystal orientations, round brackets or parentheses are used to indicate indices for __.

b. individual planes

When indexing or drawing crystal orientations, curly brackets are used to indicate indices for __.

a. families of planes (when indexing or drawing)

A crystallographic plane in a unit cell can be indexed using __ of the plane with the __ unit-cell __.

a. intercepts; 3; axes

A crystallographic plane's __ can be used to draw the plane in the unit cell.

b. HKL indices

The planar packing factor of a crystallographic plane of a given crystal can affect the __ of that __.

b. properties; plane (PPF)

The atom planar-density of a crystallographic plane of a given crystal can affect the __ of that __.

b. properties; plane

A slip system is where a metal crystal __ on specific __ and along specific __ that are related to the crystal structure of the metal.

d. deforms; planes; directions

Metals deform on __ planes and in __ directions.

a. close-packed; close-packed

Solid-state lasers are typically grown by __ deposition of __ of atoms on a specific __.

e. vapor-phase; layers; plane

Gems like diamond grow on __ that reveal the __ of the gem.

c. specific planes; crystal structure

To determine the Miller indices of a plane in a unit cell, we specify an origin at a __ of the unit cell; record __ of the plane with the __; take the __ of the __; reduce these to the __ integer values; enclose these in __.

d. corner; intercepts; axes; reciprocals; intercepts; smallest; Parentheses

In the Miller indices for a plane, negative intercepts are represented by __ the indices.

b. bars above

A direction with the same indices as a plane is __ the plane.

c. perpendicular to

If we are given the Miller indices of a plane, we do the following to draw it. Draw a __; select an origin; invert the __ to obtain __ on the axes; mark the __ along the xyz axes; draw the __ connecting the __.

e. unit cell; indices; intercepts; intercepts; plane; intercepts

Dendrites in FCC materials grow on __ planes.

a. {100} (dendrite)

NaCl fracture typically occurs on __ planes.

a. {100}

Polyethylene chain folding occurs on the __ plane.

c. {110}

When determining the number of atoms on a given plane, we __ atoms whose centers are in the plane, and we __ atoms whose centers are above or below the plane.

a. include; do not include

The individual planes in a given family of planes have __ packing densities.

c. the same

In Miller indices, square brackets [] are used to denote __.

a. individual directions (in miller indices)

In Miller indices, angled or carrot brackets <> are used to denote __.

familes of directions (in miller indices)

In Miller indices, half-moon brackets or parentheses, () are used to denote __.

a. individual planes

In Miller indices, curly brackets {} are used to denote __.

d. families of planes

The Miller indices [1 0 0] indicate __.

a. an individual direction [1 0 0]

The Miller indices <1 0 0> indicate __.

d. a family of directions = [100], [010], [001]

The Miller indices (1 0 0) indicate __.

c. an individual plane (1 0 0)

The Miller indices {1 0 0} indicate __.

a. a family of planes = (100), (010), (001)

A slip system includes __ and __.

a. slip planes; slip directions

A slip plane is the plane on which __.

b. the easiest slippage occurs

Slip means __.

b. Deformation

The slip plane is typically the plane with the __ of atoms.

a. closest packing (slip plane)

A slip direction is the direction of __ during deformation.

b. movement of atoms.

Slip directions are typically the directions with the __ of atoms.

a. closest packing

FCC stands for a __ crystal.

e. Face-Centered Cubic

In FCC crystals, the __ planes are the close-packed planes.

c. {111}

In FCC crystals, the __ directions are the close-packed directions .

d. <110>

The FCC slip systems are indicated by __.

b. <110>{111}

How many {111} planes are there in the FCC system?

b. 4

How many <110> directions are there in the FCC system?

a. 3

How many slip systems are there in the FCC system?

b. 12

Crystal growth and metal deformation can be affected by __ in a unit-cell.

d. crystal plane orientations

When indexing or drawing crystal orientations, __ are used to indicate indices for individual planes.

d. round brackets or parentheses

When indexing or drawing crystal orientations, curly brackets are used to indicate indices for __.

c. families of planes (when indexing)

A crystallographic __ in a unit cell can be indexed using intercepts of the __ with the 3 unit-cell axes.

c. plane; plane

A crystallographic __ HKL indices can be used to draw the __ in the unit cell.

b. plane's; plane

The atomic __ of a crystallographic plane of a given crystal can affect the properties of that plane.

c. planar-density

A __ is where a metal crystal deforms on specific __ and along specific __ that are related to the crystal structure of the metal.

a. slip system; planes; directions

Metals __ on __ planes and in __ directions

a. deform; close-packed; close-packed

Solid-state __ are typically grown by vapor-phase deposition of __ of atoms on a specific __.

e. lasers; layers; plane

Gems like __ grow on specific planes that reveal the __ of the gem.

c. diamonds; crystal structure

To determine the __ of a plane in a unit cell, we specify an origin at a corner of the unit cell; record __ of the plane with the axes take the __ of the intercepts; reduce these to the __ integer values; enclose these in __.

d. Miller indices; intercepts; reciprocals; smallest; Parentheses

In the __ for a plane, negative intercepts are represented by bars above the __.

b. Miller indices; indices

A direction with __ as a plane is __ to the plane.

c. the same indices; perpendicular

If we are given the ____ of a plane, we do the following to draw it. Draw a unit cell; select an origin; invert the __ to obtain __ on the axes; mark the intercept along the __; draw the __ connecting the intercepts.

e. Miller indices; indices; intercepts; xyz axes; plane

When determining the number of atoms on a given plane, we include atoms whose __are in the __, and we do not include atoms whose __ are __ the __.

a. centers; plane; centers; above or below; plane

The Miller indices [1 1 1] indicate __.

e. an individual direction

The Miller indices <1 1 0> indicate __.

d. a family of directions = [110], [101], [011]

The Miller indices (1 1 1) indicate __.

e. an individual plane

A slip __ includes slip planes and __.

a. system; slip directions

1. Crystal defects __ to material properties.

b. are beneficial or detrimental

2. Crystal defects can __ to modify and control a material's __.

c. be intentionally engineered; performance

3. Crystal defects can be classified as __, __, __, or __ defects.

a. 0-D; 1-D; 2-D; 3-D

4. Crystal defects can be classified as __, __, __, or __ defects.

b. point; linear; planar; volume

5. A point defect is a __ dimensional defect.

a. 0

6. A linear defect is a __ dimensional defect.

b. 1 (linear defect is a __)

7. A planar defect is a __ dimensional defect.

c. 2 (Planar defect is a ___)

8. A volume defect is a __ dimensional defect.

d. 3 (volume defect is a __)

9. A substitutional foreign atom is a __ dimensional defect.

a. 0 (substitutional)

10. An interstitial foreign atom is a __ dimensional defect.

a. 0 (interstitial)

11. An edge dislocation is a __ dimensional defect.

b. 1 (edge dislo)

12. A screw dislocation is a __ dimensional defect.

b. 1

13. A foreign grain of material in an otherwise uniform polycrystalline material is a __ dimensional defect.

d. 3

14. A grain-boundary is a __ dimensional defect.

c. 2 (grain-boundary)

15. Metals can be __ by intentionally incorporating certain kinds of defects.

a. strengthened

16. A semiconductor material's conductivity can be __ by intentionally incorporating certain kinds of defects.

c. raised or lowered

17. A motorcycle headlight bulb is on the order of __ meters in size.

b. 1E-2

18. The grain-size and orientation of a motorcycle headlight's tungsten filament is on the order of __ meters in size.

e. 1E-5

19. Crystal-defects and diffusion in a motorcycle headlight's tungsten filament are on the order of __ meters in size.

e. 1E-8

20. The crystal structure and unit cell of a motorcycle headlight's tungsten filament are on the order of __ meters in size.

a. 1E-10 (crystal structure and UC)

21. The atomic bonds of a motorcycle headlight's tungsten filament are on the order of __ meters in size.

b. 1E-10 (atomic bonds)

22. The atomic structure (of individual atoms) of a motorcycle headlight's tungsten filament are on the order of __ meters in size.

b. 1E-10

23. One centimeter is __ meters.

b. 1E-2

24. One micron is __ meters.

b. 1E-6

25. One Angstrom is __ meters.

e. 1E-10

26. Examples of 0-D point defects include __, __ and __.

a. vacancies; interstitial atoms; substitutional atoms

27. Examples of 1-D linear defects include __.

b. dislocations

28. Examples of 2-D planar defects include __.

e. grain boundaries (Examples of 2D)

29. A vacancy is a __ dimensional defect.

a. 0 (vacancy)

30. A vacancy is a __ defect.

b. point (vacancy)

1. An interstitial is a __ dimensional defect.

a. 0 (an interstitial is a ___)

2. An interstitial is a __ defect.

b. point (interstitial defect)

3. A substitutional atom is a __ dimensional defect.

d. 0

4. A substitutional atom is a __ defect.

b. point

5. A dislocation is a __ dimensional defect.

a. 1

6. A dislocation is a __ defect.

a. line

7. A grain-boundary is a __ dimensional defect.

c. 2

8. A grain-boundary is a __ defect.

d. planar

9. An empty lattice site is a __ defect.

b. vacancy

10. A smaller impurity atom between lattice sites is __ defect.

a. an interstitial