Dynamic Recrystallization Behavior of Mg-11Gd-3Y-0.5Nd-Zr Alloy with Two Typical Initial Orientations
The forged Mg-11Gd-3Y-0.5Nd-Zr alloy was annealed at 520 ℃ for 18 h.Then the 0° sample and 90° sample were taken parallel to and perpendicular to the forging direction respectively,and hot compression was carried out along the sample axial direction.The dynamic recrystallization behavior of the samples under hot compression with different deformation(25％,50％,70％)was studied.The mechanism of plastic deformation and its influence on dynamic recrystallization were analyzed.The results show that the dynamic recrystallization area fraction of the 0° sample and 90° sample increased with the increase of the deformation.The dynamic recrystallization area fraction of 90° sample was smaller than that of 0° sample,especially when the deformation was 50％the difference between those two was largest.The plastic deformation mechanism of 0° sample and 90° sample was prismatic plane slip.The number of initiating grains of the non-slip system of 90° sample was less comparied to that of 0° sample,the Schmidt factor for prismatic plane slip was closer to 0.5,the low angle grain boundary density was larger,and the proportion of intergranular deformation coordination factor close to 1 was larger,indicating that the slip of the 90° sample was easier to start,the intergranular deformation coordination ability was stronger,the deformation was more dispersed,and was more difficult to activate dynamic recrystallization.
万方数据
维普
