Aircraft Materials - Non-Ferrous

Question 1

What is the effect of precipitation heat treatment on aluminium?

Answer 1

It speeds up age hardening process

Question 2

Aluminium exposed to air will

Answer 2

Oxidise and become electrically insulated

Question 3

What care should you take with 2024-T3?

Answer 3

Do not scratch or make nicks in it

Question 4

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

Answer 4

Brittle

Question 5

Anodising protects alloy metal from corrosion and does what else?

Answer 5

Makes a good surface for paint to adhere to

Question 6

Pure aluminium is

Answer 6

Highly resistant to corrosion

Question 7

Precipitation treating makes the metal

Answer 7

Harder, stronger and less ductile

Question 8

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

Answer 8

24

Question 9

Aluminium alloyed primarily with magnesium is numbered

Answer 9

50xx

Question 10

Non heat treatable materials

Answer 10

Can be hardened by strain hardening or cold workings

Question 11

Cold working of a material is used to reduce

Answer 11

Wear of manufacturing tools

Question 12

The main metal in Monel is

Answer 12

Nickel

Question 13

Why is nickel chromium used in many exhaust systems?

Answer 13

Corrosion resistant and low expansion Coefficient

Question 14

Titanium alloys

Answer 14

Have a high strength to weight ratio

Question 15

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

Answer 15

20

Question 16

Clad aluminium alloys are used in aircraft because they

Answer 16

Are less subject to corrosion than uncharted aluminium alloys

Question 17

Non heat treatable aluminium alloys

Answer 17

Can be hardened by strain hardening

Question 18

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

Answer 18

Oxide layer

Question 19

Why is clad alloy preferred to pure Aluminium?

Answer 19

Tougher

Question 20

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

Answer 20

Stronger

Question 21

Age hardening of aluminium is

Answer 21

Never carried out

Question 22

Alcad is

Answer 22

Duralumin with aluminium coating

Question 23

The oxide film on the surface of aluminium is

Answer 23

Non porous

Question 24

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

Answer 24

Cladding

Question 25

The critical aspects of heat treatment are

Answer 25

Temperature, method of heating and cooling

Question 26

What is generally true for titanium alloy?

Answer 26

It is stronger than aluminium

Question 27

Malleable materials are

Answer 27

Easy to forge

Question 28

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

Answer 28

Malleability

Question 29

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

Answer 29

An alloy

Question 30

Malleable materials are normally

Answer 30

Easily forged

Question 31

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

Answer 31

Materials with large grain size are more prone to creep

Question 32

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

Answer 32

Fatigue failure

Question 33

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

Answer 33

Solution treated and naturally aged

Question 34

Money metal consists of approximately

Answer 34

66% nickel and 33% copper

Question 35

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

Answer 35

Malleability

Question 36

What is fatigue?

Answer 36

Cyclic stressing of a part

Question 37

Annealing of aluminium

Answer 37

Removes stresses caused by forming

Question 38

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

Answer 38

Diameter

Question 39

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

Answer 39

Toughness

Question 40

What is a fusible material?

Answer 40

The ability of a metal to melt

Question 41

Brittleness is

Answer 41

The property of inability to deform before cracking

Question 42

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

Answer 42

Directly proportional to stress

Question 43

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

Answer 43

Load / Cross sectional area

Question 44

A material's yield strength is the ability to

Answer 44

Resist deformation

Question 45

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

Answer 45

Tensile testing

Question 46

How many times can clad alloy be heat treated?

Answer 46

3 times