Abstract
Superplastic forming has been one of the forming techniques for aircraft industry. In developing superplastic aircraft-used aluminum alloys, two successful means have been applied. One was to modify the alloys by adding extra amounts of particle-forming elements, such as the case of Al-Cu base Supral 150 with 0.5 wt% of Zr added (Al-6wt%Cu-0.5%Zr). The other was to process the commercial alloys by a series of thermomechanical treatments (TMTs), such as the efforts made for the Al-Zn-Mg base 7075 and Al-Li base 8090 alloys. There have been numerous efforts in processing aluminum materials to exhibit high rate superplasticity (HRSP) and/or low temperature superplasticity (LTSP). Based on the current development situation, this study is intended to process the low-priced commercial 5083 alloys using simple TMTs so as to develop LTSP at temperatures below 300 C and with superplastic elongations in excess of 200%.
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