| why are aluminium alloys used in aircraft | they are low density so therefore quite light so can be used in aircraft |
| define alloy | a mixture of a metal blended with other elements |
| how is an alloy made | melting a metal, mixing it in with other elements and letting it cool |
| why are alloys often preferred over pure metals | they are much stronger as their layers are distorted by atoms of different sizes which prevents the layers from sliding |
| what is bronze an alloy of and how is it used | its an alloy of copper and tin, its extremely hard and used for statues |
| what is brass an alloy of and how is it used | its an alloy of copper and zinc, its harder than copper but can be formed into shapes so its used as musical instruments and door handles |
| what is gold alloyed with to make is stronger for jewellery and what is the purity of gold rated in | silver, copper and zinc, carats |
| what is steel | an alloy of iron with specific amounts of carbon and other metals |
| describe high carbon steel | its very hard but brittle, commonly used for cutting tools |
| describe low carbon steel | its softer and more easily shaped so its used for car bodies |
| how is stainless steel made and why can it be preferred over normal steel | it contains chromium and nickel, its resistant to corrosion so often preferred |
| why are aluminium alloys used in aircraft | they are low density so therefore quite light so can be used in aircraft |
