C9.3 Alloys and their properties

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Last updated 5:44 PM on 4/15/26
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4 Terms

1
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What is an alloy and what are some of its features?

  • Mixture of a metal with other elements

  • Alloys can be harder and stronger than pure metals, and be more resistant to corrosion and extreme temperatures

    • These features make them more useful than pure metals

2
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What are the types of alloys?

  • Brass: alloy made of copper and zinc

  • Stainless steel: alloy made of iron and other elements like chromium, nickel and carbo

3
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Explain the structure of alloys and how it makes them stronger than metals

  • Alloys have an irregular arrangement of atoms

  • They typically contain atoms of different sizes, which distorts the regular arrangement metals usually have

    • Regular arrangement: positive ions in a sea of delocalised electrons

  • The distortion alloys have make it more difficult for the metal layers to slide over each other

    • This make alloys stronger than metals

<ul><li><p>Alloys have an irregular arrangement of atoms</p></li><li><p>They typically contain atoms of different sizes, which distorts the regular arrangement metals usually have</p><ul><li><p>Regular arrangement: positive ions in a sea of delocalised electrons</p></li></ul></li><li><p>The distortion alloys have make it more difficult for the metal layers to slide over each other</p><ul><li><p>This make alloys stronger than metals</p></li></ul></li></ul><p></p>
4
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What are alloys used for?

  • Alloys can be used to make a variety of tools due to their hardness and resistance to corrosion/rusting

  • Stainless steel is used to make cutlery since it is resistant to rusting and its hardness