Metals Flashcards
Work Hardening
Many metals will harden and become more brittle as you bend or hammer them in to new shapes.
Annealing
Heat the metal up above its recrystallisation temperature
- decreases the hardness
- restoring the ductility to so it be further worked on without cracking
Hardening
Heating the steel to red hot and then quenching to reduce temperature fast
- becomes brittle
Tempering
Reheating the metal to a lower temperature than first time around and then leaving to cool more slowly
(AFTER HARDENING)
Define Non-Ferrous Metals and give examples.
Metals that do not contain iron
- Aluminium, zinc, copper, brass, bronze, silver, gold
Define Ferrous Metals and give examples.
Metals that do contain iron
- Steel, Iron
Define ‘Alloy’.
A metallic substance composed of two or more elements.
Advantages of Aluminium.
- can be easily coloured by anodization
- electrical and thermal conductor
- highly reflective when polished
- ductile
- malleable
- impermeable and odourless
- non-magnetic
- lightweight
- easily recycled
- easy to work and machine
Disadvantages of Aluminium.
- difficult to weld
- painting processes directly do not bond well
- anodizing is an expensive finishing process
- not particularly hard (scratches easily)
Advantages of Copper.
- good electrical and thermal conductor
- very malleable and ductile
- tough
Disadvantages of Copper.
- not corrosion resistant
- poor tensile strength
- expensive
- not hard (easily scratched)
Advantages of Silver.
- malleable
- thermal and electrical conductor
- antibacterial
- dense material (difficult to counterfeit)
Disadvantages of Silver.
- soft and scratches easily
- not especially corrosion resistant
- expensive
Advantages of Pewter
Disadvantages of Pewter
Advantages of Stainless Steel.
Disadvantages of Stainless Steel.
Advantages of Brass.
Disadvantages of Brass.
