Superplastic Blow Forming of 2219 Aluminium Alloy

Abstract

Superplasticity in 2219 aluminum alloy was achieved through thermomechanical processing. Tension tests showed that the alloy exhibits superplastic behavior in the temperature range of 450-540°C and strain rates ranging from 2.2x10 -5 to 1.1x10 -1 s -1 . A maximum elongationto-failure of 670% was recorded at 500°C and at the initial strain rate of 2.2x10 -4 s -1 . High cavitation level and intensive grain growth were observed. Sheet of the 2219 aluminum alloy was blow formed into conical shape using two different methods: simple negative and backpressure forming. A strain of 2.1 was obtained at 500°C under the backpressure blow forming condition. It was found that elongation to failure under blow forming with backpressure is about 1.5 times higher than that under a simple female forming. Microstructural evolution of blow formed parts was also examined.

Tensile Deformation Behaviors of Aluminum Alloy 2219 at High Temperatures from 415°C to 515°C

“…Bing et al [6] explored the severe plastic deformation behavior of a commercial 2219 aluminum alloy, while, the tensile tests in this study revealed no evidence for superplasticity at temperature from 300 to 400℃. The superplastic behavior of the aluminum alloy 2219 was studied by R. Kaibyshev et al [7,8], their researches showed that this alloy exhibits superplastic behavior in the temperature range of 450-540℃ and strain rate range of 2.2x10 -5 to 1.1x10 -4 s -1 .…”