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Part 66 Module 6 > Module 6.2 > Flashcards

Module 6.2 Flashcards

1
Q

What does the term non-ferrous mean?

A

A non ferrous material is one that has an element other iron as it’s base material.

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2
Q

What ore is aluminium obtained from?

A

Bauxite

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3
Q

What two elements when alloyed with aluminium improve strength? And are they lighter or heavier than steel?

A

Copper and zinc.

Lighter by a 1/3

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4
Q

What do each digit in the aluminium alloy index refer to?

A

1st Main alloying element
2nd Modifications
3rd and 4th Alloy designators

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5
Q

What does the term modification mean with respect to aluminium alloys?

A

Heat treatment of the alloy

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6
Q

What two alloying elements of aluminium are prone to corrosion?

A

Copper and zinc

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7
Q

How is corrosion overcome in 2024 and 7075 aluminium alloys?

A

Cladding with pure aluminium.

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8
Q

What thickness is ALClad.

A

3-5%

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9
Q

How can Cladded material be indentified?

A

Printed with Clad, Al-Clad, A or ALC

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10
Q

What is the most common magnesium alloy used in aircraft?

A

AZ31

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11
Q

Why is AZ31 used in aircraft?

A

Good mechanical properties and low mass density. 2/3 the mass of aluminium.

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12
Q

In AZ31 what does each character mean?

A

A - refers to Aluminium
Z - refers to Zinc
3 - refers to 3% Aluminium content
1 - refers to 1% Zinc content

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13
Q

How much lighter is pure Titanium than CRES?

A

50% lighter

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14
Q

What properties do alpha alloys of titanium have?

A

Medium strength and good elevated temperature strength.

Can be welded and forged.

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15
Q

What properties do alpha-beta alloys of titanium have?

A

Medium strength once annealed and much higher strength when heat treated.

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16
Q

What properties do beta alloys of titanium have?

A

Medium strength and has excellent characteristics for forming.

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17
Q

What are the two nickel alloys?

A

Monel and Inconel

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18
Q

What are the breakdowns of both nickel alloys?

A

Monel - 68% nickel and 29% copper
Inconel - 80% nickel and 14% chromium

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19
Q

What to property do copper alloys have?

A

Good electrical and heat conductors

20
Q

What are 3 common copper alloys?

A

Brass, Beryllium and Bronze

21
Q

What two types of heat treatment are used on aluminium alloys?

A

Solution and precipitation

22
Q

What are the 3 ways to solution heat treat?

A

Molten sodium bath
Molten potassium nitrate bath
Hot air furnace

23
Q

In solution heat treatment what is the range in temperature?

A

440 - 525 degrees centigrade

24
Q

What is the maximum amount of time allowed between soaking and quenching?

A

10 seconds

25
Q

What 2 alloys of aluminium cannot be heat treated?

A

Copper, 2017 and 2024

26
Q

What is natural ageing?

A

Alloying an alloy to cool at room temperature.

27
Q

How much strength do aluminium alloys gain in the first 30 minutes?

A

90%

28
Q

How long does it take to fully harden an aluminium alloy?

A

4 - 5 days

29
Q

How can age hardening be slowed?

A

Holding the material at -20C in a freezer.

30
Q

Why may magnesium alloys be used other alloys?

A

-2/3 as much as aluminium
-non magnetic

31
Q

What series of alloys are non-heat treatable?

A

1, 3 and 5

32
Q

How do you strain harden a material?

A

Mechanically working a material when it is below its upper critical limit.

33
Q

What type of heat treatment uses natural ageing?

A

Precipitation.

34
Q

How can age hardening be sped up?

A

By heating the metal to between 160 - 260C

35
Q

How do you anneal aluminium alloys?

A

Heating to 415C and soaking. Cooled to 260C at a rate of 25C. After 260C cooling rate is not important.

36
Q

What are the 4 aluminium alloy temper designations? (Name)

A

T, T3, T4 and T6

37
Q

What does T refer to in aluminium alloys?

A

The alloy has been solution heat treated.

38
Q

What does T3 refer to in aluminium alloys?

A

Solution heat treated followed by strain hardening.

39
Q

What does T4 refer to in aluminium alloys?

A

The alloy underwent solution heat treatment followed by natural ageing.

40
Q

What does T6 refer to in aluminium alloys?

A

The alloy underwent solution heat treatment followed by artificial ageing.

41
Q

What does reheat treatment do?

A

Relives internal stresses, improves mechanical properties and allows cold working of the material.

42
Q

What does the F in hardness designators?

A

F - fabricated

43
Q

What does O represent in the hardness designators?

A

O - annealed

44
Q

What does the H refer to in the hardness designator series?

A

H - strain hardened

45
Q

What does the first digit after the H represent in the hardness designators?

A

H1, H2, H3 - refers to if the material has been further treated or not

46
Q

What does the second digit after the H represent in the hardness designators?

A

2, 4, 6, 8, 9 - represent the hardness

47
Q

Does wrought aluminium have a coarse or fine grain structure?

A

Fine structure

Part 66 Module 6 (4 decks)

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