Hot deformation and processing map of 2519A aluminum alloy

The flow stress features of 2519A aluminum alloy have been studied by isothermal compression in the temperature range from 300 to 450 degrees C with strain rates of 0.01-10 s(-1) on Gleeble-1500 machine. The results show that the deformation temperature and the strain rate have obvious effects on the flow characteristic, and the flow stress increases with increasing strain rate and decreasing temperature. The flow stress of 2519A aluminum alloy deformed in the strain rate range of 0.01-1 s(-1) shows a dynamic recovery character; while that deformed at the strain rates of 10 s(-1) and in the deformation temperature range of 350-450 degrees C shows part dynamic recrystallization character. The processing map at the strain of 0.5 is obtained and exhibits two safe deformation domains (350-400 degrees C at 0.001 s(-1) and 300-450 degrees C at 1-10 s(-1)). According to the processing map and microstructure observation, the optimum hot-working condition for 2519A aluminum alloy is determined to be 450 degrees C and 10 s(-1). (C) 2010 Elsevier B.V. All rights reserved.