Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

M6 > 6.2- Aircraft Materials- Non Ferrrous > Flashcards

6.2- Aircraft Materials- Non Ferrrous Flashcards

1
Q

Why is titanium used widely in the aircraft industry?

A

High strength, light weight, temp resistance and corrosion resistance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The weight of titanium is approximately what of steel?

A

56% but has the same strength.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What temperature is the strength of titanium held too?

A

800°F or 427°C.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What methods can titanium be worked by?

A

It can be sheared, drawn, pressed, machined, routed, sawn and nibbled.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What must the cutting dies and shear blades be made of to machine titanium?

A

Good quality steel and kept very sharp.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Why must a fire extinguisher be kept on hand when working with titanium?

A

Because the swarf is extremely flammable if a spark gets to it. Its recommended to use a liquid coolant whilst machining.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Titanium is not a good conductor of heat so what happens during machining?

A

The built up heat doesn’t dissipate.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Name some of the methods developed to machine titanium?

A

Use low cutting speeds
Maintain high feed rates
Use plenty of cutting fluid
Use sharp tools and replace them at the first sign of wear.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

With the presence of oxygen what temperature will titanium ignite?

A

1065°C (1950°F).

with nitrogen it ignites at 815°C.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Why is pure cast aluminium highly corrosion resistant?

A

It has a non porous oxide coating that forms on the surface.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Wrought and cast irons are identified by a four digit system, what are the designated by?

A

The Aluminium Association of America (AA number).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does the first digit of the AA number show?

A

Main alloying element.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does the second digit of the AA number show?

A

Alloy modification.
0-orginal alloy
1-9- modifications.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the melting point of aluminium?

A

660°C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Aluminium alloys such as 2024 and 7075 are susceptible to corrosion, how are they protected.

A

With aluminium cladding, sheets of aluminium and 1% zinc.

Thickness is 3-5% of core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

If the first digit of the aluminium designation is 2 what alloy is it?

A

Copper.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

If the first digit of the aluminium designation is 3 what alloy is it?

A

Manganese.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

If the first digit of the aluminium designation is 4 what alloy is it?

A

Silicon.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

If the first digit of the aluminium designation is 5 what alloy is it?

A

Magnesium

6 is magnesium and silicon.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

If the first digit of the aluminium designation is 7 what alloy is it?

A

Zinc.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

If the first digit of the aluminium designation is 8 what alloy is it?

A

Other elements.

22
Q

Give the characteristics of 1100 aluminium.

A

Pure
Soft and ductile
Excellent corrosion resistance

23
Q

Give the characteristics of 3003 aluminium.

A

Manganese
Most widely used
Higher strength than 1100

24
Q

What is work hardening?

A

Strengthening of metal by plastic deformation.

25
Q

What is the process of solution heat treatment

A

Heated in molten sodium or potassium nitrate or hot air furnace. Temp is then held at +/- 50°C. Then cooled or quenched.

26
Q

What is natural age hardening?

A

Occurs at room temperature and is the process of copper precipitating the grain boundaries.

27
Q

How can age hardening be slowed down?

A

By freezing the alloy immediately after quenching.

28
Q

What is artificial age hardening also know as?

A

Precipitation hardening.

29
Q

What does artificial age hardening do?

A

Locks all the particles together in the grain, increasing strength stability and resistance to corrosion.

30
Q

How many times can a clad material be heat treated?

A

3 times.

31
Q

In the temper designation what does a W mean?

A

Unstable temper, solution heat treated.

32
Q

In the temper designation what does a F mean?

A

As fabricated (no treatment).

33
Q

In the temper designation what does a O mean?

A

Annealed.

34
Q

In the temper designation what does a H mean?

A

Strain hardened.

35
Q

In the temper designation what does a T mean?

A

Heat treated to produce stable tempers other than F, O or H.

36
Q

The temper designation is followed by a number 1-10 what do they represent?

A

The different sequence of treatments.

37
Q

If you saw TX… (e.g.TX51) in the temper designation what would this represent?

A

That it has been stress relieved. The digits that follow designate how it has been relieved.

38
Q

Non-heat treatable alloys are given what letter for designation?

A

H and then digits follow.

39
Q

If you saw H26 what would it mean for the alloy treatment?

A

Indicates strain hardened and partially annealed to 3/4 hard condition.

40
Q

If you saw H24 for example what do the first and second digits indicate?

A

1st- Treatment

2nd- Degree of hardness.

41
Q

The second digits of the strain hardening represent the degree of hardness, what are they and whats the values?

A

2 is a quarter through to 8 which is full hard and 9 which is extra hard.

42
Q

Magnesium is lighter than aluminium and was used extensively in aircraft until what three detrimental qualities were discovered?

A

At high risk to corrosion.

Difficult to work with.

Highly Flammable.

43
Q

What is a huge benefit of magnesium?

A

It is non magnetic which makes it useful for making instrument casings.

44
Q

No classification system is internationally accepted for magnesium alloys however what is used most?

A

American society for testing materials (ASTM).

45
Q

Can magnesium alloys get the same heat treatments as aluminium alloys?

A

Yes, including solution heat treatment, annealing etc.

46
Q

What does the acronym GLARE stand for?

A

Glass Reinforced Laminate its from the family of FML’s (Fibre metal laminates).

47
Q

What is an FML?

A

Consists of thin layers of metal sheet and uni-directional fibre layers.

48
Q

What does Glare consist of?

A

Aluminium and glass fibre prepreg layers.

49
Q

How many different grades of glare are there?

A

Six, they all have the consistent use of Cytec FM 94 adhesive.

50
Q

What does Glare 4B-4/3-0.4 indicate?

A

4B- Fibre orientation
4/3- 4 layers of aluminium and 3 fibre
0.4- aluminium thickness mm.

51
Q

What are the common uses of GLARE?

A

Fuselage skin on A380’s, aircraft cargo bay doors and blast resistant containers.

52
Q

What are the properties of GLARE? (6 examples)

A 
High strength
Fatigue resistant
Damage tolerant
Impact and blast resistant
Fire resistant
Thermal isolation.

M6 (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions