The isothermal compression test of 2196 alloy was carried out by Gleeble-1500 isothermal simulator with deformation temperature from 430°C to 500°C and strain rate from 0.01s−1 to 10s−1. The results show that the stress-strain curves are stable flow for the most deformation parameters. These stable flow exhibit a good ductility of 2196 alloy, also confirmed by no crack on the edge of the compressed samples. The constitutive equation is established using exponential relationship and the average activation energy Q is189.2kJ/mol. Microstructure observation show that very few recrystallized grains at original grain boundaries and triple junctions for the all deformation parameters. It is clear that the dynamic recrystallization is difficult for the 2196 alloy suffered common thermal deformation, while the main microstructure evolution mechanism is dynamic recovery. At the same deformation temperature, the recrystallization fraction decreases with increased strain rate, while the proportion of subgrain increases. The recrystallization and dynamic recovery are two main factors for the microstructure characteristics.
Microstructure evolution of 2014 aluminum alloy was studied by hot compression deformation at 410˚C to 470˚C and strain rates of 0.07 s −1 to 0.53 s −1 , to provide manufacturing references for aluminum plate. The deformation temperature and especially strain rate ranges were chosen very close to the actual processing condition. The results show that the stress-strain curves display a stable flow at the given deformation conditions, corresponding a dominant microstructure evolution behavior of dynamic recovery (DRV) and few dynamic recrystallization (DRX). After solution treated at 502˚C for 3 hours, quasi in-situ observation shows that static recrystallization (SRX) develop typical fine grains with several microns at grain boundaries, while static recovery (SRV) dominants the microstructure evolution during the soaking time, leading to a similar microstructure to that of the as-deformed. The average low angle grain boundaries (L AGBs) and high angle grain boundaries (H AGBs) display weak differences between as-deformed and solution treated specimens, which reveals a good thermal stability of microstructure for 2014 alloy. However, the deformation at the lower temperature has an obvious trend to induce SRX during solution soaking.
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