Quantitative study of nanoscale precipitates in Al-Zn-Mg-Cu alloys with different chemical compositions

被引：67

作者：

Liu, Dongmei ^{[1
]}

Xiong, Baiqing ^{[1
]}

Bian, Fenggang ^{[2
]}

Li, Zhihui ^{[1
]}

Li, Xiwu ^{[1
]}

Zhang, Yongan ^{[1
]}

Wang, Qiangsong ^{[1
]}

Xie, Guoliang ^{[1
]}

Wang, Feng ^{[1
]}

Liu, Hongwei ^{[1
]}

机构：

[1] Gen Res Inst Nonferrous Met, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 200240, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 639卷

基金：

中国国家自然科学基金;

关键词：

Precipitate; Aluminum alloy; Small-angle X-ray scattering; Chemical composition; Peak-aging; X-RAY-SCATTERING; IN-SITU; PHASE; ETA';

D O I：

10.1016/j.msea.2015.04.104

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The present work gives a quantitative study on the nanoscale precipitates in Al-Zn-Mg-Cu alloys with 6 different chemical compositions (all are in peak-aged state), by combining synchrotron-based small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) techniques. Based on the TEM observations, the size, shape, interprecipitate distance, volume fraction and number density of precipitates are extracted from SAXS data through model fitting. The results show that after peak-aging treatment, the average precipitate sizes in different alloys are close to each other, whereas the volume fraction and number density of nanoscale precipitates increase with the increasing content of Zn+Mg+Cu as well as the Zn/Mg ratio. The results also show that the alloy with a higher number density/volume fraction of nano-scale precipitates tends to have a higher mechanical strength. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：245 / 251

页数：7

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