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

Xueli Wang; Zhiqiang Xie; Huilan Huang; Zhihong Jia; Guang Yang; Lin Gu; Qing Liu

doi:10.1017/S1431927617000678

Precipitation of (Si_2-xAl_x)Hf in an Al-Si-Mg-Hf Alloy

Xueli Wang
, Zhiqiang Xie
, Huilan Huang
, Zhihong Jia^*
, Guang Yang
, Lin Gu
, Qing Liu

^*Corresponding author for this work

Chongqing University
Xi'an Jiaotong University
CAS - Institute of Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The morphology, composition, and structure of precipitates in an Al-Si-Mg-Hf alloy after heat treatment at 560°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 (Si_2-xAl_x)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.

Original language	English
Pages (from-to)	724-729
Number of pages	6
Journal	Microscopy and Microanalysis
Volume	23
Issue number	4
DOIs	https://doi.org/10.1017/S1431927617000678
State	Published - 1 Aug 2017
Externally published	Yes

Keywords

HAADF-STEM
Hf-containing precipitates
aluminum alloys
first-principle calculations

Access to Document

10.1017/S1431927617000678

Cite this

@article{6da3934a7cb84a3b80e2e812869920a6,

title = "Precipitation of (Si2-xAlx)Hf in an Al-Si-Mg-Hf Alloy",

abstract = "The morphology, composition, and structure of precipitates in an Al-Si-Mg-Hf alloy after heat treatment at 560°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.",

keywords = "HAADF-STEM, Hf-containing precipitates, aluminum alloys, first-principle calculations",

author = "Xueli Wang and Zhiqiang Xie and Huilan Huang and Zhihong Jia and Guang Yang and Lin Gu and Qing Liu",

note = "Publisher Copyright: {\textcopyright} 2017 Microscopy Society of America.",

year = "2017",

month = aug,

day = "1",

doi = "10.1017/S1431927617000678",

language = "英语",

volume = "23",

pages = "724--729",

journal = "Microscopy and Microanalysis",

issn = "1431-9276",

publisher = "Oxford University Press",

number = "4",

}

TY - JOUR

T1 - Precipitation of (Si2-xAlx)Hf in an Al-Si-Mg-Hf Alloy

AU - Wang, Xueli

AU - Xie, Zhiqiang

AU - Huang, Huilan

AU - Jia, Zhihong

AU - Yang, Guang

AU - Gu, Lin

AU - Liu, Qing

PY - 2017/8/1

Y1 - 2017/8/1

N2 - The morphology, composition, and structure of precipitates in an Al-Si-Mg-Hf alloy after heat treatment at 560°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.

AB - The morphology, composition, and structure of precipitates in an Al-Si-Mg-Hf alloy after heat treatment at 560°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.

KW - HAADF-STEM

KW - Hf-containing precipitates

KW - aluminum alloys

KW - first-principle calculations

UR - https://www.scopus.com/pages/publications/85021147895

U2 - 10.1017/S1431927617000678

DO - 10.1017/S1431927617000678

M3 - 文章

C2 - 28629490

AN - SCOPUS:85021147895

SN - 1431-9276

VL - 23

SP - 724

EP - 729

JO - Microscopy and Microanalysis

JF - Microscopy and Microanalysis

IS - 4

ER -

Precipitation of (Si_2-xAl_x)Hf in an Al-Si-Mg-Hf Alloy

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this