(1. 长沙理工大学 汽车与机械工程学院,长沙 410114;
2. 中南大学 材料科学与工程学院,长沙 410083)
摘 要: 采用透射电子显微镜,研究含钪Al-Zn-Mg-Cu-Zr系铸态合金在退火过程中二次Al3(Sc,Zr)粒子的析出形貌、尺寸及分布。结果表明:含0.20%Sc的7系铝合金铸态试样在450 ℃退火2 h后,α(Al)基体内析出呈豆瓣状的二次Al3(Sc,Zr)粒子;在450 ℃退火32 h后,Al3(Sc,Zr)粒子尺寸为16~23 nm;在450 ℃退火32 h后的二次Al3(Sc,Zr)相与α(Al)基体完全共格。
关键字: 铝合金;二次Al3(Sc,Zr)粒子;Sc;析出
7××× aluminum alloys during annealing
(1. School of Automobile and Mechanic Engineering, Changsha University of Science and Technology,
Changsha 410114, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract:The microstructures, sizes and distribution of Al3(Sc, Zr) secondary particles in Al-Zn-Mg-Cu-Zr alloy containing Zr during annealing were studied by transmission electron microscopy. The results show that the bean-like Al3(Sc, Zr) secondary particles precipitate from α(Al) matrix in Al-Zn-Mg-Cu-Zr as-cast alloy with 0.20%Sc after annealing at 450 ℃ for 2 h. The size of the Al3(Sc, Zr) secondary particles is 16−23 nm after annealing at 450 ℃ for 32 h. These particles are completely coherent with the α(Al) matrix.
Key words: Al3(Sc, Zr) secondary particle; Sc; precipitation