Study and Analysis on Plastic Processing Properties of AZ81 Alloy As-extruded
The deformation behavior of AZ81 alloy as-extruded was investigated by compression test using Gleeble1500D thermal simulator system under the temperature of 320 ℃ to 440 ℃ and strain rate of 0.001 s-1 to 1 s-1.The results show that the deformation behavior at elevated temperature analyzed by processing map theory can indicate the microstructure evolving law of the alloy under different deformation condition.The processing maps were calculated according to the dynamic materials model.The characteristic of hot deformation was analyzed,the instability criterion ξ(e)0 shows that the hot deformation performance is good when hot deformation temperature of 320 ℃～440 ℃ and strain rate of 0.001 s-1～1 s-1.The optimum parameters of hot processing are hot deformation at 380 ℃～400 ℃ and strain rate of 0.01 s-1～0.1 s-1.