Alloys

• What is an alloy?


  A metal mixed with other elements
• Are alloys harder or softer than pure metal? Why?

  Harder

  The Layers do not slide over eachother
• What is Bronze made from

  copper and tin
• What is Bronze used for, why?

  Statues

  Hard + no corrosion
• What is brass made from

  zinc and copper
• What is brass used for

  water taps and door fittings
• Why is gold often alloyed?

  too soft
• What is the purity of gold measured in?

  carats
• What is 100% pure gold?

  24 carats
• What is 75% pure gold?

  18 carats
• What is steel made from?

  iron and carbon
• High density carbon steel is...

  Hard and brittle
• Low density carbon steel is...

  softer and shapeable
• Why do we used stainless steel?

  Steel can rust
• What is stainless steel made from?

  chromium and nickel
• What is the use of aluminium alloys?

  low density but harder

  good for aeroplane bodies