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material science > Midterm 1 > Flashcards

Midterm 1 Flashcards

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1
Q

Properties of Materials (6)

A

Mechanical, Thermal, Optical, Magnetic, Environmental, Electrical

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2
Q

Mechanical Properties Need to Know (6)

A

Yield Strength, Youngs Modulus, Ultimate Tensile Strength, Fracture Strength, Ductile, Toughness

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3
Q

Triangles and Direction

A

Properties, Structure, Processing, Performance

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4
Q

Which In the Triangle Is Science

A

Structure and Properties

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5
Q

Which in the Triangle is Engineering

A

Processing and Performance

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6
Q

Primary Materials

A

Metal, Ceramic, Polymer

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7
Q

What Bond is Metal

A

Metallic

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8
Q

What Bond is Ceramic

A

Ionic

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9
Q

What Bond is Polymer

A

Covalent

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10
Q

Properties of Metal

A

Dense, Strong, Reflective, Opaque, High Thermal and Electrical Conductive, Medium Melting Point, Can Corrode

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11
Q

Properties of Ceramic

A

High Melting Point, Resistor, Brittle, Corrode Resistant, Glassy, Inelastic, Medium Density

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12
Q

Polymer Properties

A

Corrode Resistant, Low Density, Soft, Ductile, Thermal and Electrical Conductive, Translucent or Transparent

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13
Q

Which is stronger Faster Cooling Or Slower

A

Faster Cooling is Stronger

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14
Q

Atomic Structure

A

Proton Electron Neutron

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15
Q

Charge of Proton

A

Positive

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16
Q

Charge of Electron

A

Negative

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17
Q

Charge of Neutron

A

Neutral

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18
Q

Isotopes

A

Element with 2 or more different atomic masses

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19
Q

Quantum Number N

A

Principle (energy shell level)

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20
Q

Quantum Number L

A

Subsidiary (Orbitals)

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21
Q

Quantum Number m_L

A

Magnetic

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22
Q

Quantum Number m_s

A

Spin

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23
Q

Value of L

A

N-1

24
Q

Value of m_l

A

(+-)L

25
Q

Max electrons in subshell

A

s=2 p=6 d=10 f=14

26
Q

Higher level electron rule

A

After 3p 4s 3d

27
Q

Which section of the periodic table gives and which takes

A

Bottom left gives more upper right takes

28
Q

Which bonding is directional

A

Covalent

29
Q

Why are metals strong even if the bond is weak

A

They are densely packed because they are non directional and ordered packing

30
Q

SC unit cell length

A

2r

31
Q

fcc unit cell length

A

2rad2

32
Q

bcc unit cell length

A

4/rad3

33
Q

2d coordinate number

A

4

34
Q

sc coordinate number

A

6

35
Q

fcc coordinate number

A

12

36
Q

bcc coordinate number

A

8

37
Q

Atoms per unit cell 2d

A

1

38
Q

atoms per unit cell sc

A

1

39
Q

atoms per unit cell fcc

A

4

40
Q

atoms per unit cell bcc

A

2

41
Q

Atomic Packing Factor Formula

A

((2)(4/3)(r^3))/a^3 a = cell length

42
Q

Atomic packing factor sc

A

.52

43
Q

atomic packing factor fcc

A

.74

44
Q

atomic packing factor bcc

A

.68

45
Q

theoretical density formula

A

(atoms/unitcell)(g/mol)/(a^3)(6.022*10^23)

46
Q

Four Axis System

A

U = (1/3)(2u-v) V=(1/3)(2v-u) T = -(U+V) W=w

47
Q

Planes

A

Take reciprocal, reduce out of fraction

48
Q

X-ray defreaction

A

n(wavelength)=2dsin(angle)

49
Q

space between hkl

A

a/rad(h^2+k^2+l^2)

50
Q

defraction angle

A

2(theta)

51
Q

Vacancy

A

empty site in structure

52
Q

Equilibrium Vacancy Concentration

A

density = nA/(V_c)(N_A) = NA/(VN_A)

53
Q

N_v/N=exp(-Q_v/kT)

A

N_v = number of vaccants N= total atomic sites Q=Activation energy k = Boltzmans constant T = temperature

54
Q

interstitals

A

Extra atoms

55
Q
A

material science (1 decks)

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