Precipitation of (Si2-x Alx)Hf in an Al-Si-Mg-Hf Alloy

被引：2
|
作者：
Wang, Xueli [1 ]
Xie, Zhiqiang [1 ]
Huang, Huilan [1 ]
Jia, Zhihong [1 ]
Yang, Guang [2 ,3 ]
Gu, Lin [4 ]
Liu, Qing [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Xi An Jiao Tong Univ, Key Lab, Elect Mat Res Lab, Minist Educ, Xian 710049, Shaanxi, Peoples R China
[3] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Shaanxi, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
来源：
MICROSCOPY AND MICROANALYSIS | 2017年 / 23卷 / 04期
基金：
中国国家自然科学基金;
关键词：
aluminum alloys; Hf-containing precipitates; HAADF-STEM; first-principle calculations; TRANSFORMATION; ZR;
D O I：
10.1017/S1431927617000678
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The morphology, composition, and structure of precipitates in an Al-Si-Mg-Hf alloy after heat treatment at 560 degrees C for 20 h were studied by means of C-s-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectrometry (EDS), high-resolution transmission electron microscopy (HRTEM), and first-principle calculations. Precipitates with three kinds of morphologies were observed. The rectangular and square precipitates were predominantly (Si2-xAlx)Hf phases, while the nanobelt-like precipitate is the Si2Hf phase. First-principle calculations were used to show that the Si6 and Si8 sites were the most favorable sites for Al incorporation in the orthorhombic Si2Hf phase.
引用
收藏
页码：724 / 729
页数：6
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