Hot compression deformation behavior of extruded WE71 magnesium alloy
The hot compression deformation behaviors of extruded WE71 magnesium alloy at deformation temperatures of 653-773 K and strain rates of 0.001-1 s-1 were investigated by hot simulation tests,and the microstructure,dynamic recrystallization process of instability zone and processable zone in hot processing map were analyzed using EBSD.The results show that extruded WE71 magnesium alloy has a positive strain rate sensitivity,and the peak stress decreases with the increase of deformation temperature,and increases with the increase of strain rate.The dynamic recrystallization occurs under the condition of 653 K and 0.1 s-1.With the decrease of strain rate,the dynamic re-crystallization fraction increases and the average grain size decreases.With the increase of deformation temperature,the dynamic recrystalliza-tion fraction increases,but too high deformation temperature can increase the average grain size.For extruded WE71 magnesium alloy,thermal processing in low temperature and high strain region should be avoided.The optimum hot processing conditions are given:733 K≤T≤773 K,0.001 s-1≤·ε≤0.01 s-1.
万方数据
维普
