Alloys
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.
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.
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
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.
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2 comments:
Interesting post. I am looking for blogs related Lead oxide Manufacturers.
Its looks good but it needs more clarifications. Thank you for your post.
great notes,it kind of has all you need for revision just if u could even explain more of these stuff it would be great anyway thanks
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