(1. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200030；2. 長岡技術科学大学 機械系，新潟 940-2188，日本)
摘 要: 采用背散射电子衍射技术(EBSP)分析AZ91镁合金在热压缩变形过程中的流变行为及组织演变特征。研究表明，该合金在热压缩实验中通过动态再结晶过程细化基体晶粒。随应变速率降低，稳态组织的平均晶粒尺寸增大，大尺寸晶粒比例和大边数晶粒比例增加。流变曲线的峰值应力随Zener-Hollomon参数的增大而增大。
关键字: AZ91合金；动态再结晶；流变行为；组织转变
（1. National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University, Shanghai 200030, China;2. Department of Mechanical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan）
Abstract:The deformation behavior and microstructure evolution characteristics of the AZ91 magnesium alloy during hot compression process is studied by the electron back-scattered diffraction pattern (EBSP) approach. The results suggest that dynamic recrystalliztion (DRX) occurs during the compression process. The DRX in turn refines the grains. When the strain rate is decreased, the average grain size, the fractions of large-size grains and the fraction of large-side grains in the final microstructures are increased. The peak stress of the flow stress curve increases along with the increase of the Zener-Hollomon parameter.
Key words: AZ91 alloy; dynamic recrystallization; flow behavior; microstructure evolution
