Aluminium is a metal. It is used
to make "alloy". An alloy is a mixture of metals and has
slightly different properties than the individual metals it is composed
of. Solder is a mixture of lead and tin. It has a lower melting point than
either lead or tin. What you might call alloy (as opposed to an alloy) is
a mixture of aluminium and magnesium and is used to make alloy wheeels.
This is stronger than either pure aluminium or magnesium, but very much
lighter than steel.
