Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1635740 | Transactions of Nonferrous Metals Society of China | 2016 | 9 Pages |
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 sâ1. 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 (â¥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 (â¥1 sâ1), dynamic recrystallization is more prominent in the specimen deformed at 530 °C and 10 sâ1 than in the specimen deformed at 460 °C and 0.1 sâ1 even though they have very close ln Z values.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Qun-ying YANG, Dong YANG, Zhi-qing ZHANG, Ling-fei CAO, Xiao-dong WU, Guang-jie HUANG, Qing LIU,