First thing you need to realise is that every element has a different size atom i.e. hydrogen (being the first element on the periodic table) has the smallest atoms whilst roentgenium (one of the last elements on the periodic table) is one of the biggest. An easy way to remember this is looking at an elements atoms mass! The larger the number (atomic mass) the larger that elements atom is.
Now if you were to add carbon to a block of a pure metal block (which has a larger atomic mass than carbon), you would give the metal different properties because the carbon atoms are smaller which will upset the regularity of the metal atoms. This causes them to change there layering, which makes them considerably stronger. So, alloys are stronger than the metal in its pure element form.
Some alloys you may need to know:
Bronze = Copper + Tin (Bronze is far stronger than copper)
Cupronickel = Copper + Nickel (This is hard and corrosive resistant)
Gold tends to be an alloy due to the fact that gold as a pure metal is to soft. Metals such as zinc, copper, silver and palladium is used to harden gold.
Aluminium alloys are used to make aircraft because aluminium is a low density metal which can be alloyed with other metals to make it a lot stronger!
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