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:) Flashcards

1
Q

ratio of the object’s mass to its volume

A

density

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2
Q

commonly used in manufacturing and have lower density

A

alloy

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3
Q

averages 494lbs per cubic ft while stainless is a bit less

A

steel

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4
Q

half density of steel and aluminum is about ⅓

A

titanium

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5
Q

importance of knowing the density of metals:

A

identification
manufacturing
quality control
engineering
recycling

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6
Q

solid to liquid

A

melting point

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7
Q

importance on why melting point is important

A

manufacturing
allow development
material selection
safety

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8
Q

amount of energy needed to change the temperature of a material

A

heat capacity

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9
Q

key component in predicting casting solidification

A

thermal property

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10
Q

heat transported to a material

A

thermal conductivity

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11
Q

draw heat from electrical components to cool them

A

heat sinks

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12
Q

response to a change of temperature

A

thermal expansion

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13
Q

effects of change in temperature

A

shape
area or
volume

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14
Q

need to consider when designing tooling for metal casting

A

thermal exapansion

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15
Q

allows a material to pass through it

A

electrical conductivity

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16
Q

applications of electrical conductivity

A

electrical wiring
electronics
heating

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17
Q

material response to an applied external magnetic field

A

magnetic property

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18
Q

is the strongest type of magnetism which exhibited by an iron

A

ferromagnetism

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19
Q

example of ferro magnetism

A

electrical transformer
hard disk drive

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20
Q

amount of light that reflects on the metal

A

luster

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21
Q

application of luster

A

jewelry
reflective coatings
lighting
automotive industrial finishes
architecture

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22
Q

how much force an object can withstand without breaking or bending

A

strength

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23
Q

tells manufacturers how much material must be used to meet a specific strength requirement

A

strength to weight ratio

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24
Q

strength is often measure in terms of material’s response to stresses or applied forces in 3 configurations:

A

compresion
tension
shear

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25
Q

volume of material reduces

A

compression stress

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26
Q

coplanar with crosssection of material

A

shear stress

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27
Q

force pulling in opposite directions

A

tension stress

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28
Q

pulling apart until failure occur

A

tesile testing

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29
Q

crushing until failure occur

A

compressing test

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30
Q

repeated twisting motion

A

torsion testing

31
Q

force applied to an object

A

stress

32
Q

stress increases, strain increases

A

true

33
Q

material response to tensile stress

A

ductility

34
Q

response to compressive stress

A

malleability

35
Q

deform plastically and absorb energy before fracture

A

tougness

36
Q

key to a toughness

A

balance between strength and ductility

37
Q

cyclical stress without fracturing or permanently deforming

A

fatigue resistance

38
Q

resistance to deformation scratching cutting

A

hardness

39
Q

done by pressing a sphere made of carbide or hardened steel into the surface9f the part being measured

A

brinell hardness

40
Q

given as the load divided by the surface area of the identation

A

brinell hardness number

41
Q

metals that reacts with oxygen

A

metal oxides

42
Q

metals donate electrons to oxygen

A

metal oxides

43
Q

material is reduced to more stable state via chemical reaction

A

corrosion

44
Q

to resist corroding forces

A

corrosion resistance

45
Q

metal from least to most resistant in corrosion

A

carbon
galvanized
aluminum
stainless
red metals

46
Q

gangue particles are lighter than the ore

A

hydraulic washing

47
Q

used for oxides and carbonate ores

A

hydraulic washing

48
Q

passed through stream of water

A

hydraulic washing

49
Q

used for sulfide ores

A

froth floatstion method

50
Q

crushed ore and water are added to a tank in which a frother such as pine oil is added and air is blownunder pressure to create the froth

A

froth floatation method

51
Q

used whenmetal or gangue particle have magnetic property

A

magnetic separation

52
Q

passed over conveyor belt with magnetic rollers

A

magnetic separation

53
Q

used when ore is soluble in q solvent

A

leaching method

54
Q

crushed ore is treated with a solvent that dissolves the ore leaving behind the impurities

A

leaching method

55
Q

heating of concentrate metal ore in presence of air

A

roasting

56
Q

heating of concentrated metal ore in a limited supply of air

used for metal carbonates of metal hydroxides

A

calcination

57
Q

using a reducing agent

A

reduction

58
Q

impure metal is made at the anode while pure metal is made at the cathode using metal salt solution as electrolyte

A

electrolytric refining

59
Q

ions present in the epectrolytes get reduced in the cathodeand get oxidized at the anode

A

electrolysis of molten ore

60
Q

iron

A

pure element
occurs naturally
easily gets oxidized
weaker and more brittle
more ductile

61
Q

steel

A

an alloy
man-made
less tendency to get oxidized
stronger and harder
less ductile

62
Q

maximum carbon content of 0.008% weight of carbon

A

pure iron

63
Q

0.008 to 2.14% carbon content

A

steel

64
Q

greater than 2.14%

A

cast iron

65
Q

types of ferrous alloys on phase diagram

A

pure iron
steel
cast iron

66
Q

has body centered cubic structure

exists at low temperature and low carbon weight

stable at room temperature

magnetic below 768°C

A

a-ferrite

67
Q

has face centered cubic structure

unstable at temperature below eutectic temperature (727°C) unless cooled rapidly

non magnetic

A

y-ferrite

68
Q

has similar structure as a-ferrite but exist only qt high temperature

melting point: 1538°C

A

delta ferrite

69
Q

hard and brittle

decomposes extremely slowlyat room temperature in graphite

A

cementite

70
Q

liquid solution of iron carbon

as carbon increase in an alloy the melting point decreases

A

Fe- C liquid solution

71
Q

upper limit of the ferrite/ cementite phase field

A

A1

72
Q

temperature where iron loses its magnetism(769°C)

A

A2

73
Q

points where multiple phases meet

A

eutectic points

74
Q

points meeting in eutectic point

A

A1 A3 Acm

prelim (1 decks)

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