Dynamic recrystallization behavior of 7085 aluminum alloy during hot deformation

作者：Li, Dong-feng; Zhang, Duan-zheng; Liu, Sheng-dan^*; Shan, Zhao-jun; Zhang, Xin-ming; Wang, Qin; Han, Su-qi

来源：Transactions of Nonferrous Metals Society of China, 2016, 26(6): 1491-1497.

DOI：10.1016/S1003-6326(16)64254-1

• aluminum alloy
• Zener-Hollomon parameter
• dynamic recrystallization
• strain-induced boundary migration
• Al3Zr dispersoids

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.

• 出版日期2016-6
• 单位湖南工程学院; 中南大学