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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第32卷    第5期    总第278期    2022年5月

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文章编号:1004-0609(2022)-05-1277-12
7055铝合金中纳米尺度Al2ZnZr的结构和析出特征
娄艳芝,李春志

(中国航发北京航空材料研究院 钢与稀贵金属研究所,北京100095)

摘 要: 利用透射电子显微镜(TEM)观察和分析了7055-T7751预拉伸厚板中的一种纳米尺度析出相,采用选区电子衍射(SAED)分析方法以及能谱成分分析方法(EDS)对析出相的结构和成分进行了表征,并结合析出相的明场像和高分辨(HRTEM)像,确定了析出相的种类、形貌和分布特征;通过分析基体α(Al)的五个低指数晶带轴([100]、[110]、[111]、[112]和[013])的SAED图特征,确定了纳米析出相与基体之间的取向关系;采用会聚束电子衍射(CBED)分析方法测定了入射电子束方向铝合金试样的局部厚度,分析了这种析出相的数密度。结果表明:7055-T7751预拉伸厚板中存在纳米尺度析出相Al2ZnZr,呈球形或圆片状,尺寸大多在20 nm左右;Al2ZnZr为简单立方(SC)结构,点阵参数为a=0.403 nm;7055-T7751预拉伸厚板中析出相Al2ZnZr的数密度约为3.44×1011 mm-3;简单立方(SC)结构的析出相Al2ZnZr与面心立方(FCC)结构的基体α(Al)之间存在共格关系,二者之间的取向关系为 、〈001〉Al//〈001〉 。

 

关键字: 7055铝合金;Al2ZnZr;析出相;取向关系;会聚束电子衍射;薄晶体厚度;数密度

Microstructure and precipitation characteristics of nano-scale Al2ZnZr in 7055 aluminum alloy
LOU Yan-zhi, LI Chun-zhi

Department of Steel and Rare-Noble Metals, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:In this paper, a kind of nano-scale precipitate in 7055-T7751 aluminum alloy was studied by TEM. Bright field images and HRTEM images were observed in order to determine the morphology and distribution characteristics. SAED and EDS analysis were performed to characterize the composition and structure. In addition, by analyzing the SAED patterns of five low-index zone axes of α(Al) (including [100], [110], [111], [112] and [013]), the orientation relationship between the precipitates and the matrix was determined. Finally, the local thickness of the aluminum alloy specimen was measured by CBED, and the number density of this precipitate was further determined. The results show that there are nano-scale Al2ZnZr precipitates in 7055-T7751 pre-stretched thick plate. The precipitates are spherical or dics-shaped, and most of them are about 20 nm in size. The structure of Al2ZnZr precipitates is simple cubic (SC) with lattice parameter a=0.403 nm. The number density of Al2ZnZr precipitates in 7055-T7751 aluminum alloy is about 3.44×1011 mm-3. Moreover, there is a coherent relationship between Al2ZnZr with simple cubic (SC) structure and α(Al) with face centered cubic (FCC) structure, and the orientation relationship between them is , 〈001〉Al//〈001〉 .

 

Key words: 7055 aluminum alloy; Al2ZnZr; precipitate; orientation relationship; convergent beam electron diffraction(CBED); thin foil thickness; number density

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

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

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