With regard to what property? physical, mechanical or economic?
They do both alloy togetther to produce a brittle intermetallic.
One of several commonalities is that both are avaible in cast and
wrought forms and have several alloy families.
The greatest distinction is that steel is typically hardenable over a
wider bandwidth of hardnesses than aluminum alloys - tensile strength
of steel (and iron) alloys extends from about 20 ksi to 250 ksi -
aluminum alloys from 10 ksi to 120 ksi.
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