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本文对Zn-22％Al材料超塑性状态与非超塑状态进行了挤压及镦粗变形对比,实测了硬度分布及网格变化,对变形区组织也进行了分析。结果表明,由于超塑性状态的应变速率强化敏感及边界粘性摩擦的影响使其变形的特点与非超塑性状态有着明显的区别。对于超塑性状态的正挤压与反挤压变形可观察到其变形区较深,网格畸变剧烈,但是显微组织在各部位变化不大。由于超塑性细晶粒弥散强化的影响,无论是挤压变形还是镦粗变形,超塑性状态的硬度比非超塑性状态的略高。对于镦粗变形,超塑性状态的鼓形肚曲率半径较非超塑性的大。
In this paper, the superplasticity and non-superplasticity of Zn-22% Al material were compared by extrusion and upsetting deformation. The distribution of hardness and the change of the grid were measured, and the deformation zone organization was also analyzed. The results show that there is a clear difference between the deformation characteristics and the non-superplastic state due to the super-plastic strain rate sensitivity and boundary viscous friction. For the superplastic state of the positive extrusion and reverse extrusion deformation can be observed in the deformation zone deeper, severe grid distortion, but the microstructure little change in various parts. Due to the effect of the superplastic fine grain dispersion strengthening, the superplasticity hardness is slightly higher than the non-superplasticity state, whether it is extrusion deformation or upset deformation. For upsetting deformation, superplastic state of the drum belly curvature radius than the non-superplasticity.