Metals and Alloys

In the beginning!! Tool where made out of stone (C) Then Cu and Sn Then bronze But bronze is not an element!

Alloys A mixture made of 2 or more elements that has the properties of a metal At least 1 element is a metal Cu + Sn = Bronze

Properties of Metals Hard Shinny Conductive Ductile Malleable

Properties of Alloys Au is soft and malleable Au rings are hard? Alloys are used more then pure metals Stronger Less reactive to air and water

Properties of Alloys Fe is used in steel Stainless Steel = Fe + C + Ni + Cr Does not rust Hard

Making Alloys Melt elements and mix in together in carefully measured amount It’s a recipe Mix element powders and heat them under pressure Uses less energy to create

Steel Strong, hard, resistant to corrosion Not all steels are alike but they all have iron Carbon steel Wrought iron

High Carbon Steel 0.6 – 1.5 percent carbon Tools, knives, springs

Low Carbon Steel Less than 0.2 percent carbon Ductile and malleable Nails, cables, chains

Other Alloys Bronze Brass Sterling silver Solder Amalgam