(1. 長沙理工大學(xué) 汽車與機械工程學(xué)院，長沙 410114；
2. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 采用透射電子顯微鏡，研究含鈧Al-Zn-Mg-Cu-Zr系鑄態(tài)合金在退火過程中二次Al3(Sc，Zr)粒子的析出形貌、尺寸及分布。結(jié)果表明：含0.20%Sc的7系鋁合金鑄態(tài)試樣在450 ℃退火2 h后，α(Al)基體內(nèi)析出呈豆瓣狀的二次Al3(Sc，Zr)粒子；在450 ℃退火32 h后，Al3(Sc，Zr)粒子尺寸為16~23 nm；在450 ℃退火32 h后的二次Al3(Sc，Zr)相與α(Al)基體完全共格。
關(guān)鍵字: 鋁合金；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
