Metals

Question 1

Stainless steel

Answer 1

Alloying ingredients include chrome and nickel

+ High corrosion resistance
+ Fracture toughness
+ Temperature resistance
- Expensive
- Hard to machine / weld

Question 2

Duralumin

Answer 2

Used for aircraft frames and automobiles
Formed of aluminium, magnesium, and copper
+ Ductile
+ Workable in the normal state
- Low corrosion resistance
- Low wear resistance

Question 3

Brass

Answer 3

Used for low friction applications e.g locks, gears, and bearings
Composed of copper and zinc
+ Ductile
- Prone to tarnishing

Question 4

Aluminium

Answer 4

Used for cans, foil, kitchen utensils, and aeroplane parts

+ Lightweight
+ Recyclable
- High cost
- Low fracture toughness

Question 5

Copper

Answer 5

Used in wiring and motors

+ Very good conductor
+ Durable
- Corrosion resistant
- Allergenic

Question 6

Zinc

Answer 6

Used to galvanise iron and other metals

+ Corrosion reistant
+ Highly durable
- Heavy
- Expensive

Question 7

Tin

Answer 7

Not easily oxidised as it is obtected by an oxide film

+ Soft
+ Ductile
+ Non-toxic
- Corrosive

Question 8

Titanium

Answer 8

Used for aircrafts, spacecrafts, golf clubs, bikes, and laptops

+ Strong
+ Durable
+ Corrosion resistant
- Hard to machine
- Expensive

Question 9

Low carbon steel

Answer 9

Less than 0.25% carbon, relatively soft and weak but has good ductility and toughness

Question 10

High carbon steel

Answer 10

From 0.6% to 1.5% carbon content an known for high strength and hardness but being very brittle

Question 11

Medium carbon steel

Answer 11

Made from 0.30% to 0.60% and stronger and durable than low carbon steel but still offers some ductility. It is also hard and tough

Question 12

Cast iron

Answer 12

Used in pipes, washers, and pans

+ High compressive strength
- Durable
- Heat retaining
- Low fracture toughness
- Heavy