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

页码：724 / 729

页数：6

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