For larger feeders (2ga and up) aluminum is pretty common. I haven't seen any small conductors used for years. (early 70s)
The real problems involved screw terminations and the metal used in the screw but the reputation killed the product.
A lot has been installed, trouble free, using lugs. Aluminum wire in an aluminum lug, as most are, may actually perform better than copper.
It all has to do with the expansion rate of the 2 metals.
