含钪超高强铝合金在应变速率10-3 s-1下的热流变及动态再结晶行为
Hot deformation behavior and dynamic recrystallization of Sc modified ultra-high-strength aluminum alloy at strain rate of 10-3 s-1
李昂 1张毅 1陈开媛 2吴福 1高蔚1
作者信息
- 1. 核工业理化工程研究院,天津 300180;国防科技工业核材料技术创新中心,天津 300180;粒子输运与富集技术重点实验室,天津 300180
- 2. 核工业理化工程研究院,天津 300180;国防科技工业核材料技术创新中心,天津 300180
- 折叠
摘要
采用等温热压缩实验和电子背散射衍射分析技术,研究了Al-11.1Zn-2.3Mg-2.0Cu-0.05Sc合金在应变速率10-3 s-1,变形温度653～733 K条件下的热流变及动态再结晶行为,建立动态再结晶临界应力、临界应变、相对含量、晶粒平均尺寸的拟合方程.结果表明:相关特征参数的拟合方程可以较好地描述含钪铝合金在实验条件范围内的动态再结晶行为.变形温度的升高会增加晶粒内部的取向差,减弱晶粒沿法向的择优取向,有助于动态再结晶的发生.动态回复是含钪铝合金的主要软化机制.随着温度的变化,铝合金微观组织存在不连续动态、连续动态及几何动态三种再结晶机制.
Abstract
The hot deformation behavior and dynamic recrystallization of Al-11.1Zn-2.3Mg-2.0Cu-0.05Sc alloy was explored in the isothermal hot compression test with a temperature range of 653-733 K at strain rate of 10-3 s-1. The microstructural evolution of the studied alloy at different temperatures was analyzed by EBSD technology. The dynamic recrystallization(DRX) critical strain,critical stress,fraction,and average grain size equations were established by linear regression. The results show that the fitted equations can accurately describe the DRX characteristics of the studied alloy during hot deformation. The increase in the deformation temperature enlarges the misorientation angle inside the grains,which facilitates the DRX progress. The distributions of crystal orientation tend to be more homogeneous with the increase in temperatures. Moreover,dynamic recovery is the dominant dynamic softening mechanism.With the temperature change,there are three types of recrystallization mechanisms in the microstructure of aluminum alloy,including discontinuous dynamic recrystallization,continuous dynamic recrystallization,and geometric dynamic recrystallization.
关键词
含钪铝合金/动态再结晶/热流变行为/低应变速率/微观组织演化Key words
Sc modified aluminum alloy/dynamic recrystallization/hot deformation behavior/low strain rate/microstructural evolution引用本文复制引用
基金项目
粒子输运与富集技术重点实验室项目(SYSJJ-22410)
出版年
2024
国家科技期刊平台
NSTL
万方数据