AZ91镁合金的热力行为和显微组织演化(英文)

• 作 者: G. R. EBRAHIMI A. R. MALDAR H. MONAJATI M. HAGHSHENAS
• 机 构: Department of Materials Engineering, Faculty of Engineering, Ferdowsi University of Mashhad,Departme
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2012年09期
• 关键词: 镁合金 显微组织 再结晶晶粒 AZ91镁合金 热压缩 再结晶 峰应变 热压缩变形 应变速率 压缩过程

研究AZ91镁合金在热压缩过程中的流变行为和显微组织演化。在350～425℃对试样进行热压缩变形。在应变速率为0.1 s-1时,应变分别为峰应变、0.3和0.5。使用光学和扫描电子显微镜研究显微组织的演化。结果表明, 在压缩过程中再结晶晶粒沿预先存在的晶界形核;动态再结晶晶粒的数量随着应变的增大呈指数增加,且服从Avrami方程;动态再结晶晶粒的尺寸在开始时增大,达到最大值后开始减少。

The rheological behavior and microstructure evolution of AZ91 magnesium alloy during hot compression were investigated. The samples were hot compression set at 350 ~ 425 ℃. At a strain rate of 0.1 s-1, the strains are respectively peak strain, 0.3 and 0.5. The use of optical and scanning electron microscopy to study the evolution of microstructures. The results show that the recrystallized grains form nuclei along the pre-existing grain boundaries during compression. The number of dynamic recrystallized grains increases exponentially with the increase of strain and obeys the Avrami equation. The size of dynamic recrystallized grains is in the range of The beginning of the increase, after reaching the maximum began to decrease.