1. Metals and Alloys

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

3. 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

4. Properties of Metals
Hard
Shinny
Conductive
Ductile
Malleable

5. 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

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

7. 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

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

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

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

11. Other Alloys
Bronze
Brass
Sterling silver
Solder
Amalgam