Topic 4.2A: Metals

Question 1

Grain size

Answer 1

Large/Coarse grains (slow cooling):
* Higher tensile strength, toughness, ductility
* malleable

Small grains (rapid cooling):
* Lower tensile strength, toughness, ductility
* higher brittleness

Question 2

Alloy

Answer 2

mixture with at least 1 metal, can be a mixture with another metal or other non metal

Question 3

Work hardening

Answer 3

processof toughening a material through plasticity deformation

Question 4

Tempering

Answer 4

heat treating process to increase toughness of iron based metals by heating it and allowing it to cool in air. decreases hardness and brittleness and increases ductility

Question 5

Super Alloys

Answer 5

metal alloys that exhibit excellent mechanical strength, resistance to corrosion, good surface stability and resistance to thermal creep deformation

Question 6

Ferrous

Answer 6

contains iron, e.g Mild steel, Stainless steel, Cast iron

Question 7

Non-Ferrous

Answer 7

doesn’t contain iron e.g. Aluminum, copper, silver, tin, zinc

Question 8

Alloys

Answer 8

Brass: castings, marine and plumbing fittings (for its corrosion resistance)
High Speed Steel (HSS): cutting tools like drills and saw blades