Just to confuse things even more, all aluminum must go through the smelting process, then be cast into standard shapes, i.e., slabs or blooms. These can then be remelted and die cast. This is the quickest and cheapest way to form a finished part. If not diecast, the blooms can be rolled into sheets as specified by the buyer. They can also be extruded, that is forced through a die the shape of the end product, then cut to length. They can be stamped in a press. They can also be forged into shape. Forging produces the strongest parts. Billet machining is the most expensive because it takes the longest and produces the most scrap. Billet machining is no indicator of strength or quality.
All of these processes are used with steel, bronze, alloys, and even titanium.
I'm sure most of you already knew most of this. For those that didn't, are you sufficiently confused yet?