作　　者： (丁永根）; (王薄笑天）; (李萍）; (薛克敏）;

机构地区： 合肥工业大学材料科学与工程学院,合肥230009

出　　处： 《中国有色金属学报》 2017年第6期1125-1131,共7页

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<102>、<111>方向上出现了择优取向。 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 A1 matrix, the microstructures are significantly refined, fine dynamic recrystallization structure occurs at the trigeminal grain boundaries. The density of texatres 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 （102） and （111）.

关 键 词： 合金 高压扭转 显微组织 织构 高径比