Feature of Flow Stress of 2519 Aluminum Alloy During Hot Compressive Deformation

The flow stress features of 2519 aluminum alloy during plastic deformation at elevated temperature were studied by the isothermal compression test using Gleeble-1500 hot simulator. The compression test was performed in the temperature range from 300 ℃ to 500 ℃ and in the strain rate range 0.05 s -1 to 25 s -1. The experimental results show that the flow stress of 2519 aluminum alloy increased with increasing strain and tended to be constant after a peak value at lower strain rates (≤25 s -1), showing dynamic recover. The flow stress sawtooth fluctuated and decreased after a peak value with the increasing strain at higher strain rates(≥25 s -1), showing discontinuous dynamic recrystallization. A hyperbolic sine relationship was found to correlate well the flow stress with the strain rate, and an Arrhenius relationship with the temperature. The flow stress of 2519 alloy during high temperature deformation can be represented by Zener-hollomon parameter including the Arrhenius term.