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What is an alloy?
AN ALLOY IS A MIXTURE OF TWO OR
MORE ELEMENTS, WHERE AT LEAST ONE
ELEMENT IS A METAL. MANY ALLOYS ARE
MIXTURES OF TWO OR MORE METALS.…read more

Slide 3

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Layers
ALLOYS CONTAIN ATOMS OF DIFFERENT SIZES. THESE
DIFFERENT SIZES DISTORT THE REGULAR ARRANGEMENTS OF
ATOMS. THIS MAKES IT MORE DIFFICULT FOR THE LAYERS TO
SLIDE OVER EACH OTHER, SO ALLOYS ARE HARDER THAN THE
PURE METAL.…read more

Slide 4

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Copper, gold and aluminium are too soft for
many uses. They are mixed with other metals to
make them harder for everyday use. For
example:
BRASS - USED IN ELECTRICAL FITTINGS - IS 70 PER CENT COPPER AND 30 PER CENT
ZINC
18-CARAT GOLD - USED IN JEWELLERY - IS 75 PER CENT GOLD AND 25 PER CENT
COPPER AND OTHER METALS
DURALUMIN - USED IN AIRCRAFT MANUFACTURE - IS 96 PER CENT ALUMINIUM
AND 4 PER CENT COPPER AND OTHER METALS…read more

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Shape memory alloys
SHAPE MEMORY ALLOYS CAN RETURN TO THEIR ORIGINAL
SHAPE AFTER BEING BENT OR TWISTED. NITINOL IS A SHAPE
MEMORY ALLOY MADE FROM NICKEL AND TITANIUM. IT IS
USED IN DENTAL BRACES AND SPECTACLE FRAMES.…read more

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