Do airliners use light alloy wheels, like cars do?
Here's a description of small aircraft wheels:  


  Available in 4", 5" and 6", these wheel &amp; brake assemblies are cast from 535.2 aluminum alloy for superior strength and corrosion resistance.


And some info on 535.2 AL alloy
http://www.matweb.com/search/datasheettext.aspx?matguid=9347211fc1e1476988dfee51d8241c3c