brass, steel and bronze are the most common alloys. they are
made of:
brass: 35% zinc and 65% copper - uses, musical instruments
steel: 99% iron and 1% carbon - uses, tools, car bodies etc
bronze: 87.5% copper and 12.5% tin - uses, boat hardware and
screws etc
some not so common alloys are alnico (aluminium and nickel and
cobalt - used to make magnets) and stainless steel (18% chromium,
80.6% iron, 1% nickel and 0.4% carbon - used to make surgical tools
and tableware and cookware.)