(合肥工业大学 材料科学与工程学院，合肥 230009)
摘 要: 在380 ℃变形条件下对不同高径比的Al-Zn-Mg-Cu-Zr合金试样进行高压扭转实验，借助于EBSD和XRD技术分析变形Al-Zn-Mg-Cu-Zr合金的显微组织、第二相粒子和织构的演变规律。结果表明：在高压扭转过程中，大量第二相粒子从过饱和Al基体中脱溶析出，显微组织明显细化，在部分三叉晶界处出现了细小的动态再结晶组织；材料织构强度随着高径比的减小而减弱；当高径比为0.20时，晶粒的择优取向方向也发生了明显变化，晶粒在á102？、á111？方向上出现了择优取向。
关键字: Al-Zn-Mg-Cu-Zr合金；高压扭转；显微组织；织构；高径比
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:Al-Zn-Mg-Cu-Zr alloys with different height-diameter ratios were deformed by high pressure torsion at 380 ℃. The evolution of microstructures, second-phase particles and textures were studied by electron backscattered diffractometry (EBSD) and X-ray diffractometry (XRD). The results show that a large number of second-phase particles precipitate from supersaturated Al matrix, the microstructures are significantly refined, fine dynamic recrystallization structure occurs at the trigeminal grain boundaries. The density of textures reduces with height-diameter ratios decreasing. When the height-diameter ratio decreases to 0.20, the preferred orientation direction of grains has also undergone a significant change, it occurs on the direction of á102？ and á111？.
Key words: Al-Zn-Mg-Cu-Zr alloy; high pressure torsion; microstructure; texture; height-diameter ratio
