A new grain-refinement process for superplasticity of high-strength 7075 aluminium alloy |
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| Authors: | Jiang Xinggang Wu Qinglin Cui Jianzhong Ma Longxiang |
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| Affiliation: | (1) Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China;(2) Present address: Materials Section, Department of Mechanical and Aerospace Engineering, University of California, CA92717 Irvine, USA;(3) Department of Metal Forming, Northeast University of Technology, 110006 Shenyang, People's Republic of China |
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| Abstract: | The superplasticity of high strength 7075 aluminium alloy has been improved to a great extent by the new thermomechanical treatment proposed. This treatment (TMPA) includes solution treatment, overageing, warm-rolling deformation, recrystallization and an artificial ageing process. The maximum elongation may be up to 2100% under deformation at an initial strain rate of 8.33×10–4s–1 and a temperature of 510 °C, which is much higher than reported before. Observation of the microstructure changes revealed that the excellent superplastic elongation of the alloy seems mainly to be due to a decrease in the grain growth rate of the alloy and a reduction in the number of cavities nucleated during superplastic deformation. |
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