Dynamic recrystallization behavior of 7085 aluminum alloy during hot deformation

作     者：李东锋 张端正 刘胜胆 单朝军 张新明 王琴 韩素琦 Dong-feng LI;Duan-zheng ZHANG;Sheng-dan LIU;Zhao-jun SHAN;Xin-ming ZHANG;Qin WANG;Su-qi HAN

作者机构：中南大学材料科学与工程学院长沙410083 中南大学有色金属材料科学与工程教育部重点实验室长沙410083 湖南工程学院机械工程学院湘潭411104 中南大学有色金属先进结构材料与制造协同创新中心长沙410083 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第6期

页      面：1491-1497页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(2012CB619500)supported by the National Basic Research Program of China 

主　　题：aluminum alloy Zener-Hollomon parameter dynamic recrystallization strain-induced boundary migration Al3Zr dispersoids 

摘      要：The dynamic recrystallization behavior of 7085 aluminum alloy during hot compression at various temperatures （573？723 K） and strain rates （0.01-10 s^-1） was studied by electron back scattered diffraction （EBSD）, electro-probe microanalyzer （EPMA） and transmission electron microscopy （TEM）. It is shown that dynamic recovery is the dominant softening mechanism at high Zener？Hollomon （Z） values, and dynamic recrystallization tends to appear at low Z values. Hot compression with ln Z=24.01 （723 K, 0.01 s？1） gives rise to the highest fraction of recrystallization of 10.2%. EBSD results show that the recrystallized grains are present near the original grain boundaries and exhibit similar orientation to the deformed grain. Strain-induced boundary migration is likely the mechanism for dynamic recrystallization. The low density of Al3Zr dispersoids near grain boundaries can make contribution to strain-induced boundary migration.