Of all structural metals and alloys, the aluminum alloys are the most readily forged to precise intricate shapes. There are a number of reasons for this: aluminum alloys are ductile; they can be forged with dies heated essentially to the same temperatures as the workpiece; they do not develop scale during heating; and they require lower forging pressures. The specific forging processes are similar, in some ways, for aluminum and steel … and very different in others.
Aluminum Forging Processes: An Overview
A survey of principles, techniques, and processes for forging and heat treatment of aluminum, as well as trimming and machining, including design considerations and metallurgical factors.