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

Published online by Cambridge University Press:  20 June 2017

Xueli Wang
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Zhiqiang Xie
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Huilan Huang
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Zhihong Jia*
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Guang Yang
Affiliation:
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, China
Lin Gu
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Qing Liu
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
*
*Corresponding author. zhihongjia@cqu.edu.cn
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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 Cs-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.

Type
Materials Science Applications
Copyright
© Microscopy Society of America 2017 

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