摘要
采用硬度测试、扫描电镜、图像分析和物理建模,研究了Al-14Cu-7Ce合金中Al_8CeCu_4相的Ostwald熟化行为。结果表明,Al_8CeCu_4相的熟化过程受控于Ce元素在Al中的体扩散,其动力学满足体积修正的Lifshits-Slyozov-Wagner理论;基于通用速率公式,计算了Ce元素在Al中的体扩散系数以及Al_8CeCu_4与Al基体的界面能。
The Ostwald ripening behavior of Al8CeCu4 phase in the Al-14Cu-7Ce alloy annealed at elevated temperatures was investigated using hardness testing, scanning electron microscopy, image analyses and physical modeling. Results indicate that the average radius of Al8CeCu4 particles increases while the hardness of the alloy decreases with increasing of annealing temperature and time. The ripening process of Al8CeCu4 phase is mainly controlled by the volume diffusion of Ce. The ripening kinetic of Al8CeCu4 particles satisfies well the modified Lifshits-Slyozov-Wagner theory, taking into account the effect of the volume fraction of Al8CeCu4 particles. The volume diffusion coefficient of Ce and the interfacial energy between the matrix and Al8CeCu4 phase were also calculated based on the general rate equation.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期1106-1110,共5页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51301027,51571038)
the Natural Science Foundation of Jiangsu Higher Education Institutions of China(14KJB430002)
the Natural Science Foundation of Jiangsu Province(BK20151188)
