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ME 280 Materials > test 1 > Flashcards

test 1 Flashcards

1
Q

How does plastic deformation occur in a metal?

A

crystalline slip with dislocation motion

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2
Q

An edge dislocation consists of

A

an extra half plane of atoms

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3
Q

What effect does plastically deforming a metal have on its ductility?

A

decreases

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4
Q

An interstitial consists of

A

an extra single atom between normal lattice points

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5
Q

For a metal of a given composition, which would you expect to have the higher strength? A
sample with a fairly low number of dislocations or a sample with a very large number of
dislocations?

A

a high number

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6
Q

Dislocations remain fixed in a crystalline material during plastic deformation.

A

False

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7
Q

Interstitial

A

A point defect with an extra (same
type) atom inserted into the lattice
at the site that is not a lattice site

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8
Q

Frenkel defect

A

A vacancy-interstitial pair formed
when an ion jumps from a normal
lattice point to an interstitial site.

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9
Q

Schottkey defect

A

An anion/cation vacancy pair

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10
Q

Edge Dislocation

A

A crystal defect where there is an
extra half plane of atoms inserted
into the lattice

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11
Q

Grain Boundary

A

A defect where two grains with
different crystallographic
orientations meet

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12
Q

Plastic Deformation

A

Permanent deformation as a

response to an applied load

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13
Q

Elastic Deformation

A

Temporary deformation as a

response to an applied load

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14
Q

Dislocations remain fixed in a crystalline material during plastic deformation.

A

False

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15
Q

The ways a metal can be strengthened include all except…

A

High temperature strengthening

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16
Q

What effect does plastically deforming a metal have on its ductility?

A

decreases

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17
Q

What effect does plastically deforming a metal have on its ductility?

A

decreases

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18
Q

What do you expect would happen to the yield strength of a high purity metal if you added
atoms of a different type?

A

the yield strength would increase

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19
Q

In most materials, ductility and strength increase together.

A

False

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20
Q

For a metal of a given composition, which would you expect to have the higher strength? A
sample with a fairly low number of dislocations or a sample with a very large number of
dislocations?

A

a high number

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21
Q

Which material type is sensitive to damage from ultraviolet radiation?

A

Polymers

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22
Q

Metals

A

usually have some ductility

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23
Q

Ceramics

A

are brittle

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24
Q

Semiconductors

A

are brittle

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25
Q

Thermoplastic polymers

A

usually have some ductility

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26
Q

Thermoset polymers

A

are brittle

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27
Q

Elastomer polymers

A

usually have some ductility

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28
Q

Rank Stiffness 1 low 3 high

Ceramic:
Metal:
Thermoplastic:
Thermoset:

A

3
2
1
1

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29
Q

Which of the following materials is not a ceramic?

A

Zn

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30
Q

Materials formed from two or more materials (as opposed to elements) that produce unique
properties that are not attainable from one group alone are:

A

composites

31
Q

Which material type has the highest stiffness?

A

ceramics

32
Q

A polymer that softens when heating (repeatable) is a

A

thermoplastic

33
Q 
Melting point low1 to high 3
Ceramic:
Metal:
Thermoplastic
Thermoset
A

3
2
1
1

34
Q

The composition of a semiconductor can be tailored by very small changes in the
composition

A

True

35
Q

The bond type in which valence electrons are not bound to an atom in the solid but drift
around and form a “sea of electrons” is:

A

metallic

36
Q

At the equilibrium interatomic spacing, the energy of the solid is minimized.

A

True

37
Q

he melting point of lead is 621.5 F while the melting point of alumina (aluminum oxide) is
3762 F. Which would you expect to have a higher bond strength?

A

Alumina

38
Q

Would you expect MgO or magnesium to have the higher stiffness?

A

MgO

39
Q

The type of bonding that best conducts electricity is

A

metallic

40
Q

The major bond type in metals is:

A

metallic

41
Q

Metallic bonding consists of

A

cations surrounded by a sea of electrons that can move around

42
Q

The atomic spacing of iron is different on different continents.

A

False

43
Q

What is the difference between a ceramic and a glass? More than one answer is possible!

A

Glass is transparent; Ceramic is not

Glass is amorphous; Ceramic is crystalline

44
Q

The smallest subdivision of a crystalline structure that retains the characteristics of the entire
lattice is called a

A

unit cell

45
Q

Are amorphous structures more likely to be found in materials that have complex
molecules/structures or in materials with simple structures?

A

complex

46
Q

Match the material to the correct degree of Crystallinity

Metal

A

Crystalline

47
Q

Match the material to the correct degree of Crystallinity

Ceramic

A

Crystalline

48
Q

Match the material to the correct degree of Crystallinity

Glass

A

Amorphous

49
Q

Match the material to the correct degree of Crystallinity

Semiconductor

A

Crystalline

50
Q

Match the material to the correct degree of Crystallinity

Thermoplastic Polymer

A

Mix of Crystalline and amorphous

51
Q

Match the material to the correct degree of Crystallinity

Thermoset Polymer

A

Amorphous

52
Q

Which one of the following terms best describes the structure of a glass?

A

amorphous

53
Q

What are Mechanical Properties

A

Strength
Impact Resistance
Stiffness

54
Q

Another name for a rubber is

A

elastomer

55
Q

Which polymer type has the highest ductility?

A

Elastomer

56
Q

typical materials group

A

Polymers
Metals
Composites
Semiconductors

57
Q

Ceramics are usually:

A

compounds of metallic and nonmetallic elements

58
Q

Certain materials, such as tungsten carbide, are compounds made up of both metallic and
non-metallic elements. To which category of materials does tungsten carbide belong?

A

ceramics

59
Q

Characteristics of Ceramic

A

Poor Electrical and thermal conductor

Excellent high temp resistance

high hardness

60
Q

Bonding Energy Low to High Melting Temp

CsCl 649

MgO 3932

NaCl 766

A

3
1
2

61
Q

Metallic bonding consists of

A

cations surrounded by a sea of electrons that can move around

62
Q

Tungsten has a stiffness of 59.2x10 psi. Nickel has a stiffness of 30.0x10 psi. Molybdenum
has a stiffness of 43.4x10 psi. Which would you expect to have the highest melting point?

A

Tungsten

63
Q

The bond type in which valence electrons are not bound to an atom in the solid but drift
around and form a “sea of electrons” is:

A

metallic

64
Q

At the equilibrium interatomic spacing, the energy of the solid is minimized.

A

True

65
Q

Stiffness

A

Amount something gives in the reg

66
Q

Creep

A

Deformation from a load in respect to heat

67
Q

Fatigue

A

Failure from cyclic forces

68
Q

Yield Strength

A

Maximum Load without permanent deformation

69
Q

Materials with the exact same composition will have the same properties even if the
processing steps to produce them are different

A

False

70
Q

Which material type has the highest density?

A

metals

71
Q

Which curve would be for the material with the highest modulus of elasticity?
https://screenshots.firefox.com/KTRqPGEnIbOzfEBD/null

A

Curve B

72
Q

Which of the following bond types is the weakest?

A

van der Waals

73
Q

Compound A has a bond strength of 25 kcal/mole while compound B has a bond strength of
250 kcal/mole. Which compound would you expect to have the highest stiffness?

A

Compound B

ME 280 Materials (3 decks)

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