Superplastic aluminum alloys, alloy processes and component part formations thereof

摘要

Improved superplastic aluminum alloys are formulated to contain less than 0.05 weight percent each of iron and silicon based on the total weight of the superplastic aluminum alloy. Advantageously these two elements are present at levels of 0.03 weight percent or below, preferably 0.01 weight percent or below. Advantageous superplastic forming properties are achieved with these low iron, low silicon alloys. Further advantageous superplastic forming properties are achieved by subjecting aluminum alloys to a thermomechanical treatment followed by a rapid recrystallization-anneal treatment as, for instance, a recrystallization-anneal treatment utilizing a molten salt bath. When these formulations and processes are practiced alone, in combination with each other or together with cavitation supression improvements in superplastic forming of component parts are achieved.