1. C1a Rocks and metals 2.4 Alloys in everyday use

2. Learning objectives Understand the benefits of alloys Understand the benefits of alloys Know what a smart alloy is Know what a smart alloy is

3. Metal or Alloy? Copper Copper Gold Gold Steel Steel Zinc Zinc Magnesium Bronze Silver Brass

4. Why alloys? Pure metals not always useful Pure metals not always useful Adding other metals – produces an alloy Adding other metals – produces an alloy Has more useful properties Has more useful properties Different metals make different alloys Different metals make different alloys Copper Copper Gold Gold Aluminium Aluminium Shape memory alloys (SMAs) Shape memory alloys (SMAs)

5. Presentation Research your metal and alloy Research your metal and alloy Use PP to make 4 slide presentation Use PP to make 4 slide presentation No more than 2 mins No more than 2 mins Rest of class will use your info Rest of class will use your info Title slide/picture Source metal It’s properties What’s it used for What it’s alloyed with What properties does it give Uses of the alloy Examples/pictures

6. Copper alloys Bronze Bronze Copper and tin Copper and tin Brass Brass Copper and zinc Copper and zinc Very hard Very hard Very low friction Very low friction workable workable

7. Gold Different metals added to make it stronger Different metals added to make it stronger Different proportions = different colours Different proportions = different colours

8. Smart alloys Can be bent but return to original shape Can be bent but return to original shape Shape Memory Alloys (SMAs) Shape Memory Alloys (SMAs)

9. Aluminium and titanium Strong but heavy Strong but heavy Corrode – rusty Corrode – rusty Titanium Titanium Light Light Does not corrode Does not corrode Very high melting point Very high melting point Good for replacement body parts Good for replacement body parts Aluminium Light Good conductor Easily shaped Does not corrode Not very strong Good alloy 8 Kg every year recycle

10. Learning outcomes Why are alloys useful? Why are alloys useful? What are smart alloys? What are smart alloys?