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Aerospace Engineering-mat > Non- ferrous metals > Flashcards

Non- ferrous metals Flashcards

1
Q

How are Wrought metals different to cast metals?

A

Wrought metals have a low alloy content where as cast has a high alloy component

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2
Q

Wrought metals- Mallable?

A

yes

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3
Q

Cast metals- Mallable?

A

No, brittle

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4
Q

Wrought Metals- Manufacturing

A

Heat and worked using tools

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5
Q

Cast Metals- Manufacture

A

Melted and poured into a die

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6
Q

What is annealing and what does it do?

A

Heating up and it relieves internal stresses

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7
Q

What is Hardenability?

A

The rate at which hardening decreases with distance

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8
Q

How is initial Hardenability tested?

A

Using a Jominy end-quenched sample

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9
Q

What does hardenability depend on?

A

Alloys, Carbon content and geometry

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10
Q

What properties does precipitation hardening encourage?

A

Strength but decreased ductility

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11
Q

Describe precipitation hardening process

A

Leaves to Cu (solute atoms) forming inside of AL crystal structure

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12
Q

Processes- Forging

A

Die is pushed into metal forming the right shape

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13
Q

Processes- Rolling

A

Rolling metal to thin and also to change grain boundaries

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14
Q

Processes- Extrusion

A

Metal is pulled through die to make it a certain shape

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15
Q

Processes- drawing

A

metal is pushed though a die to thin it out

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16
Q

Why would you hot work a metal

A

To get the largest deformation possible, to get its ideal shape

17
Q

Why would you cold work a metal?

A

to change its properties- work hardening

18
Q

Aluminium- key property

A

High specific strength

19
Q

Aluminium- Structure

20
Q

Aluminium- Density

A

low- 1/3 of steel

21
Q

Aluminium- Tensile properties

A

Formable, low strength,

21
Q

Aluminium- Tensile properties

A

Formable, low strength, 30-50% elongation

22
Q

Aluminion- Conductivity

A

high electrical, coefficient of thermal expansion high- useful at a bigger range of temp

23
Q

Why is Aluminium good corrosion resistance?

A

At surface it forms an oxide, not as good with not pure Al

24
Q

Aluminium Alloys- Mg

A

Strengthen Y
Corrosion Resistance Y
LMP/ LTEC
Hardness

25
Q

Aluminium Alloys- Mn

A

Strengthen Y
Corrosion Resistance
LMP/ LTEC
Hardness

26
Q

Aluminium Alloys - Zn

A

Strengthen Y
Corrosion Resistance
LMP/ LTEC
Hardness

27
Q

Aluminium Alloys- Cu

A

Strengthen Y
Corrosion Resistance
LMP/ LTEC
Hardness

28
Q

Aluminium Alloys- Si

A

Strengthen
Corrosion Resistance Y
LMP/ LTEC- Y
Hardness

29
Q

Aluminium Alloys- Sn

A

Strengthen
Corrosion Resistance
LMP/ LTEC
Hardness Y

30
Q

Aluminium Alloys- Fe

A

Strengthen
Corrosion Resistance
LMP/ LTEC
Hardness- Y but precipitates hard to avoid

31
Q

Magnesium Structure

Aerospace Engineering-mat (8 decks)

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