Article ID Journal Published Year Pages File Type
1635740 Transactions of Nonferrous Metals Society of China 2016 9 Pages PDF
Abstract
The flow behavior and microstructure evolution of 6A82 aluminum alloy (Al-Mg-Si-Cu) with high copper content were studied on a Gleeble-1500 system by isothermal hot compression test in the temperature range from 320 to 530 °C and the strain rate range from 0.001 to 10 s−1. The results reveal that the flow stress of the alloy exhibits a continuous flow softening behavior at low temperatures of 320-390 °C, whereas it reaches steady state at high temperatures (≥460 °C), which are influenced greatly by the Zener-Hollomon parameter (Z) in the hyperbolic sine with the hot deformation activation energy of 325.12 kJ/mol. Microstructure characterizations show that prominent dynamic recrystallization and coarsening of dynamic precipitation may be responsible for the continuous flow softening behavior. Due to deformation heating at high strain rates (≥1 s−1), dynamic recrystallization is more prominent in the specimen deformed at 530 °C and 10 s−1 than in the specimen deformed at 460 °C and 0.1 s−1 even though they have very close ln Z values.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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