Non-Ferrous Metals

Question 1

Properties of Titanium?

Answer 1

Good strength to weight ratio
Corrosion resistant
56% the weight of steel

Question 2

Precautions when working with Titanium?

Answer 2

Have a fire extinguisher
Use cutting fluid
Use sharp tools

Question 3

Titanium will ignite with Oxygen at…

Answer 3

1065C

Question 4

Titanium will ignite with Nitrogen at…

Answer 4

815C

Question 5

How to protect Titanium?

Answer 5

Heat metal in atmosphere of helium gas

Question 6

Why is pure aluminium not suitable for aircraft?

Answer 6

Too soft

Question 7

When pure aluminium is alloyed with other metals, it gets…

Answer 7

Excellent corrosion resistance, very light weight

Question 8

Which aluminium is easier to work with?

Answer 8

Wrought

Question 9

What is the number for Aluminium?

Answer 9

2024

Question 10

How to protect Aluminium?

Answer 10

Clad with a thin layer of pure aluminium with 1% zinc on both sides as a means of corrosion protection. Thickness of clad is 3.5% of the material thickness. Ink print on the material corresponds to the material grain structure.

Question 11

Digit for Aluminium?

Answer 11

1xxx

Question 12

Digit for Copper?

Answer 12

2xxx

Question 13

Digit for Zinc?

Answer 13

7xxx

Question 14

What are the Non-Heat Treatables?

Answer 14

1100 Ally (soft, durable, good workability)
3003 Aluminium with Manganese (increases strength)
5052 Aluminium with Magnesium (most common used)

Question 15

What are the Heat Treatables?

Answer 15

2011 Ally Copper (good machineability)
2017 (good workability)
2024
7075 Zinc (Normally Clad)

Question 16

Describe Solution Heat Treatment

Answer 16

Metals are heated in molten sodium or potassium nitrate bath or hot air furnace. Temperature is held to within 50C, long enough for the copper to be taken into the solid solution with the aluminium matrix. Removed from ferrous and cooled or quenched. Rapid cooling must be done within 10 seconds.

Question 17

What is Cold Working?

Answer 17

Causes Copper to precipitate at the grain boundaries and harden the alloy

Question 18

What is Natural Age Hardening?

Answer 18

Copper precipitates at the grain boundaries hardening aluminium to full strength over a period of several days

Question 19

How to carry out Artificial Age Hardening

Answer 19

Temperature raised to between 1200C and 1900C, this increases precipitation hardening process and raises final strength of the alloy.

Question 20

What does T4 mean?

Answer 20

Heat treated and age hardened

Question 21

What does T3 mean?

Answer 21

Further age hardened by mechanical cold working

Question 22

What are the Basic Temper States?

Answer 22

F - Fabricated
O - Annealed 
H - Strain hardened 
W - Solution heat treated 
T - Heat treated to produce stable temperatures

Question 23

Disadvantages of Magnesium Alloys

Answer 23

Easily corrode
Difficult to work with
Highly flammable

Question 24

Advantages of Magnesium Alloys

Answer 24

Lighter than aluminium

Question 25

What is GLARE?

Answer 25

Glass Reinforced Laminate

Question 26

GLARE is a member of which family?

Answer 26

Fibre Metal Laminates (FMLs)

Question 27

Advantages of GLARE?

Answer 27

Outstanding fatigue resistance 
Excellent impact resistance 
Flame resistance 
Excellent corrosion properties 
Easy to work with 
High strength 
Good thermal insulation