These are to very good websites for anyone who wants to know just about everything one would want to know regarding Aluminum and it's many alloys and is sponsored by the European Aluminum Association which offeres this repository of knowledge free of charge I might add!!! :) :) :)

This one is called AluMatter:

http://aluminium.matter.org.uk/content/html/eng/default.asp?catid=&pageid=1

This one is called Aluselect:

http://aluminium.matter.org.uk/aluselect/default.asp

Good reference material in both of these sites covering all sorts of aluminum alloys of both wrought and castings also. ;)

Here is another excellent site from the European Aluminum Association called Talat:

http://www.eaa.net/eaa/education/TALAT/index.htm

Respectfully,
Henry