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Open AccessArticle

Modification of Eutectic Si in Al-Si-(Ba) Alloy by Inducing a Novel 9R Structure in Twins

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Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
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Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, 15 Beisihuan West Road, Beijing 100190, China
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School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
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School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China
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Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Sichuan 610031, China
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Shanghai Institute for Minimally Invasive Therapy, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
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Authors to whom correspondence should be addressed.
Materials 2018, 11(7), 1151; https://doi.org/10.3390/ma11071151
Received: 29 May 2018 / Revised: 30 June 2018 / Accepted: 4 July 2018 / Published: 6 July 2018
The change of twinning morphology plays an important role in the modification of Al-Si alloys, which are widely used in industrial applications. However, the interpretation of this change is still insufficient. In this work, the microstructure of twins was investigated in two kinds of Al-Si alloys with different additions of Ba using high-resolution transmission electron microscopy (HRTEM). Unlike the normal {111} twin that exists in Ba-free alloy, discontinuous twins and multiple twins were observed in the Ba-containing alloy. In addition, the 9R structure formed by the dissociation of twins was firstly observed at the turning of discontinuous twins and the intersection of multiple twins in Al-Si alloys. View Full-Text
Keywords: Ag-Si alloy; modification; twinning morphology; 9R structure; HRTEM Ag-Si alloy; modification; twinning morphology; 9R structure; HRTEM
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MDPI and ACS Style

Sha, X.; Chen, X.; Ning, H.; Xiao, L.; Yin, D.; Mao, L.; Zheng, J.; Zhou, H. Modification of Eutectic Si in Al-Si-(Ba) Alloy by Inducing a Novel 9R Structure in Twins. Materials 2018, 11, 1151.

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