高压扭转变形的Al-Zn-Mg-Cu-Zr合金显微组织及织构  

Microstructures and textures of Al-Zn-Mg-Cu-Zr alloy after high pressure torsion

作　　者：丁永根 王薄笑天 李萍[1] 薛克敏[1] 

机构地区：[1]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The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51575153)~~

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：AL-ZN-MG-CU-ZR合金 高压扭转 显微组织 织构 高径比 

分 类 号：TG379[金属学及工艺—金属压力加工]