M6.2 Non Ferrous Flashcards

1
Q

What is a non-ferrous metal?

A

Elements other than iron as base, non magnetic

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2
Q

How are wrough aluminium alloys made?

A

Heated and worked

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3
Q

How are cast aluminium alloys made?

A

Heated then moulded then cooled

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4
Q

What are the first major alloy groups? (1XXX)

A

1 = pure aluminium
2 = copper
3 = magnese
4 = silicon
5 = magnesium
6 = magnesium and silicon
7 = zinc

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5
Q

What are the 2 most used alloy digits in aviation?

A

2024 and 7075

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6
Q

What does cladding help prevent? What is cladding? (Fences)

A

Corrosion, adds thin layer by rolling

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7
Q

Magnesium hazard?

A

Very flammable

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8
Q

How do you put out a magnesium fire?

A

Sand

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9
Q

What happens when alloyed with titanium?

A

. Lightweight
. Lighter than steel
. Soft and ductile

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10
Q

What does titanium make?

A

Bolts, fasteners, blades

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11
Q

What are the two nickel alloys?

A

. Monel
. Inconel

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12
Q

What are Monel characteristics?

A

. Weldable
. Good when heat treated
. Used in gears

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13
Q

What are inconel characteristics?

A

. Maintain strength
. Corrosion resistant
. Can handle high temps

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14
Q

What happens when alloyed with copper?

A

. Conductivity
. Malleable and ductile

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15
Q

What are the 2 aluminium heat treatments?

A

. Solution heat treatment
. Precipitation heat treated

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16
Q

What is solution heat treatment?

A

Heat alloy with alloying elements, quench

17
Q

What is precipitation heat treatment?

A

Soft when removed from quench but gain hardness over time, cooling at room temp

18
Q

What is natural ageing?

A

Cooling at room temp

19
Q

What is artificial hardening?

A

Taking quenched alloy heating again

20
Q

What is annealing?

A

Softens metal and decreases internal stress, heated then cooled slowly

21
Q

What are the 4 temper designations? (T)

A

T = alloy that had solution heat treatment
T3 = solution heat treated then stain hardened
T4 = solution heat treated then naturally aged
T5 = solution heat treated then artificially aged

22
Q

Why do we use reheat treatment?

A

Previously heat treated but is heat treated again to gain certain characteristics

23
Q

How many reheat treatments are clad materials limited to?

A

3

24
Q

How are non heat treatable alloys changed?

A

. Cold work
. Cold rolling
. Strain hardening
. Rolling, drawing, pressing

25
Q

What are the 3 hardness designations? (H)

A

H1 = strain hardened without thermal
H2 = strain hardened and annealed
H3 = strain hardened and stabilised by low temps

26
Q

In hardness designations what does FOH mean?

A

F = as fabricated
O = annealed
H = strain hardened