Abstract:
A one-way thermal compression experiment of Al-0.2Sc-0.04Zr aluminum alloy on the Gleeble -3000D thermal simulator was conducted to study the thermal deformation behavior under the strain rate of 0.001~5 s
-1 and a thermal deformation teperature of 440~600 ℃. The results show that the degree of dynamic recrystallization increases with increasing deformation temperature or decreasing strain rate. Meanwhile, for deformation at lower temperatures (
T≤520 ℃), the main softening mechanism is dynamic recovery, and for deformation at higher temperatures (
T>520 ℃), the softening mechanism changed to a dynamic recrystallization softening mechanism, obtaining a relatively complete dynamic recrystallization structure. Deformed at high temperatures (
T≥600 ℃), the grains grow significantly. By analyzing the stress index and the deformation activation energy, the stress index (
n) increases with increasing deformation temperature. The deformation activation energy (
Q) increases with increasing deformation temperature and strain rate within the range of experimental temperatures. The peak stress of the Al-0.2Sc-0.04Zr alloy was analyzed by the hyperbolic-sine Arrhenius constitutive equation, and the average absolute relative error (AARE) between the predicted value and measured value of the alloy is only 7.428% as well as the correlation coefficient (R) 0.9708.