C1a Rocks and C1a Rocks and metalsmetals

2.4 Alloys in everyday use2.4 Alloys in everyday use

Learning objectivesLearning objectives

Understand the benefits of alloysUnderstand the benefits of alloys Know what a smart alloy isKnow what a smart alloy is

Metal or Alloy?Metal or Alloy?

CopperCopperGoldGoldSteelSteelZincZinc

MagnesiumMagnesiumBronzeBronzeSilverSilverBrassBrass

Why alloys?Why alloys?

Pure metals not always usefulPure metals not always useful Adding other metals – produces an Adding other metals – produces an

alloyalloy Has more useful propertiesHas more useful properties

Different metals make different alloysDifferent metals make different alloys CopperCopper GoldGold AluminiumAluminium Shape memory alloys (SMAs)Shape memory alloys (SMAs)

PresentationPresentation

Research your Research your metal and alloymetal and alloy

Use PP to make 4 Use PP to make 4 slide presentationslide presentation

No more than 2 No more than 2 minsmins

Rest of class will Rest of class will use your infouse your info

Title slide/pictureTitle slide/picture Source metalSource metal

It’s propertiesIt’s properties What’s it used forWhat’s it used for

What it’s alloyed What it’s alloyed withwith What properties What properties

does it givedoes it give Uses of the alloyUses of the alloy

Examples/picturesExamples/pictures

Copper alloysCopper alloys

BronzeBronze Copper and tinCopper and tin

BrassBrass Copper and zincCopper and zinc Very hardVery hard Very low frictionVery low friction workableworkable

GoldGold

Different metals added to make it Different metals added to make it strongerstronger

Different proportions = different Different proportions = different colourscolours

Smart alloysSmart alloys

Can be bent but return to original Can be bent but return to original shapeshape

Shape Memory Alloys (SMAs)Shape Memory Alloys (SMAs)

Aluminium and titaniumAluminium and titanium

Strong but heavyStrong but heavy Corrode – rustyCorrode – rusty TitaniumTitanium

LightLight Does not corrodeDoes not corrode Very high melting Very high melting

pointpoint Good for Good for

replacement body replacement body partsparts

AluminiumAluminium LightLight Good conductorGood conductor Easily shapedEasily shaped Does not corrodeDoes not corrode

Not very strongNot very strong Good alloyGood alloy

8 Kg every year8 Kg every year recyclerecycle

Learning outcomesLearning outcomes

Why are alloys useful?Why are alloys useful? What are smart alloys?What are smart alloys?