- Aluminium is mixed with copper, manganese and silicon for aircraft body production as aluminium alloys tend to be stronger and lighter than pure aluminium.
- Aluminium and magnesium (5%) make an interesting alloy called magnalium which is also used extensively in automobile and aircraft construction.
- As well as being lighter and stronger, it is also more corrosion resistant than aluminium.
- Magnalium with 50% magnesium is used in the production of fireworks as it is more stable than pure magnesium but still burns brightly.
- Bronze is an alloy made of copper and tin. It is harder than copper and is used to make ornaments and medals.
- Brass is a common example of an alloy which contains 70% copper and 30% zinc. It is decorative and corrosion resistant and is used for low friction ornamental purposes such as plumbing and carpentry fittings.
Brass is used extensively in modern kitchen and bathroom fittings
- Gold alloys are used to make jewellery.
- Gold metal is relatively soft and malleable so other metals such as copper, zinc and silver are added to provide strength and toughness.
- Carats are used to express the purity of gold jewellery.
- Pure gold with nothing else added is said to be 24 carat.
- A 12 carat piece of gold jewellery therefore contains 50% gold.
- For example a 12 carat necklace that weighs 50g contains 25 grams of gold.
Rose, yellow and white gold are alloys of gold with varying proportions of Cu, Pd and Ag