Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第3期    总第132期    2010年3月

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文章编号:1004-0609(2010)03-0451-05
7×××铝合金退火过程中二次Al3(Sc, Zr)粒子的析出行为
戴晓元1, 2,夏长清2,彭小敏2

(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

Precipitation behavior of Al3(Sc, Zr) secondary particles in
7××× aluminum alloys during annealing
DAI Xiao-yuan1, 2, XIA Chang-qing2, PENG Xiao-min2

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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