Metal alloys

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What is an alloy?
A mixture of 2 or more metals or a metal and a non-metal.
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How are steels formed?
By adding small amounts of carbon or other metals.
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Why are alloys more useful?
Because they are strong and more corrosion resistant than pure metals.
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What makes an alloy harder than a pure metal?
Different elements have different sized atoms so when an element like carbon is added, the smaller carbon atoms upset the layers of the pure iron atoms, making it difficult for them to slide over each other.
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What's a shape memory alloy?
An alloy that can return to it's original shape if changed. They 'remember' their original shape.
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Give a use of a shape memory alloy.
Glasses frames, if they get bent they can easily be reshaped. Stents in damaged blood vessels.
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How is the proportion of gold described?
Carats and fineness. 24 carats is pure gold. Fineness refers to the parts of pure gold per thousand.
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Card 2

Front

How are steels formed?

Back

By adding small amounts of carbon or other metals.

Card 3

Front

Why are alloys more useful?

Back

Preview of the front of card 3

Card 4

Front

What makes an alloy harder than a pure metal?

Back

Preview of the front of card 4

Card 5

Front

What's a shape memory alloy?

Back

Preview of the front of card 5
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