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Module 6 > Aircraft Materials - Non-Ferrous > Flashcards

Aircraft Materials - Non-Ferrous Flashcards

1
Q

What is the effect of precipitation heat treatment on aluminium?

A

It speeds up age hardening process

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2
Q

Aluminium exposed to air will

A

Oxidise and become electrically insulated

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3
Q

What care should you take with 2024-T3?

A

Do not scratch or make nicks in it

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4
Q

If aluminium alloy is not quenched within minimum time allowed after heat treatment is it will be

A

Brittle

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5
Q

Anodising protects alloy metal from corrosion and does what else?

A

Makes a good surface for paint to adhere to

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6
Q

Pure aluminium is

A

Highly resistant to corrosion

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7
Q

Precipitation treating makes the metal

A

Harder, stronger and less ductile

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8
Q

A material has the code 2024-T6 on it. Which part of the code indicates the percentage of he alloying element?

A

24

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9
Q

Aluminium alloyed primarily with magnesium is numbered

A

50xx

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10
Q

Non heat treatable materials

A

Can be hardened by strain hardening or cold workings

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11
Q

Cold working of a material is used to reduce

A

Wear of manufacturing tools

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12
Q

The main metal in Monel is

A

Nickel

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13
Q

Why is nickel chromium used in many exhaust systems?

A

Corrosion resistant and low expansion Coefficient

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14
Q

Titanium alloys

A

Have a high strength to weight ratio

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15
Q

Which part of the 2017-T36 aluminium alloy designation indicates the primary alloying agent used in its manufacture?

A

20

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16
Q

Clad aluminium alloys are used in aircraft because they

A

Are less subject to corrosion than uncharted aluminium alloys

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17
Q

Non heat treatable aluminium alloys

A

Can be hardened by strain hardening

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18
Q

When buffing surface of Aluminium Alloy, what material are you removing?

A

Oxide layer

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19
Q

Why is clad alloy preferred to pure Aluminium?

A

Tougher

20
Q

Why are aluminium alloys used on aircraft, instead of pure aluminium?

A

Stronger

21
Q

Age hardening of aluminium is

A

Never carried out

22
Q

Alcad is

A

Duralumin with aluminium coating

23
Q

The oxide film on the surface of aluminium is

A

Non porous

24
Q

The process of rolling a layer of pure aluminium over an aluminium alloy is

A

Cladding

25
Q

The critical aspects of heat treatment are

A

Temperature, method of heating and cooling

26
Q

What is generally true for titanium alloy?

A

It is stronger than aluminium

27
Q

Malleable materials are

A

Easy to forge

28
Q

If material has to undergo deep cold forming operation, the essential property would be

A

Malleability

29
Q

When two or more metallic materials are fused together, the combination is known as

A

An alloy

30
Q

Malleable materials are normally

A

Easily forged

31
Q

How does large grain size effect the mechanical properties of metal?

A

Materials with large grain size are more prone to creep

32
Q

The cracking of structural members under repeated stress lower than the ultimate tensile load is known as

A

Fatigue failure

33
Q

A sheet of metal is designated 2024-T4, the code tells us that the material is a copper based aluminium alloy which has been

A

Solution treated and naturally aged

34
Q

Money metal consists of approximately

A

66% nickel and 33% copper

35
Q

The ease with which a material can be forged, rolled and extruded without fracture is an indication of a material’s

A

Malleability

36
Q

What is fatigue?

A

Cyclic stressing of a part

37
Q

Annealing of aluminium

A

Removes stresses caused by forming

38
Q

In the Brinell hardness test, you would measure the indentation’s

A

Diameter

39
Q

The impact testing technique is used on a material to test for

A

Toughness

40
Q

What is a fusible material?

A

The ability of a metal to melt

41
Q

Brittleness is

A

The property of inability to deform before cracking

42
Q

Hooke’s law states that, within the elastic region, elastic strain is

A

Directly proportional to stress

43
Q

The given of stress for a given material can be derived by

A

Load / Cross sectional area

44
Q

A material’s yield strength is the ability to

A

Resist deformation

45
Q

What type of a test involves stretching material until it breaks?

A

Tensile testing

46
Q

How many times can clad alloy be heat treated?

A

3 times

Module 6 (14 decks)

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