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Materials 2018, 11(8), 1404; https://doi.org/10.3390/ma11081404

The Formation of Nanoparticles and Their Competitive Interaction with Twins during Eutectic Si Growth

1
College of Materials Science and Engineering, the National Base of International Science and Technology Cooperation on Hybrid Materials, Qingdao University, 308, Ningxia Road, Qingdao 266071, China
2
Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Marine Monitoring Instrument Equipment Technology, National Engineering and Technological Research Center of Marine Monitoring Equipment, Qingdao 266001, China
3
College of Materials Science and Engineering, Shandong University, 17923, Jingshi Road, Jinan 250061, China
4
Key Laboratory for Microstructures, Shanghai University, Shanghai 200444, China
*
Authors to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 1 August 2018 / Accepted: 8 August 2018 / Published: 10 August 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

In order to investigate the competitive interaction between nanoparticles and twin, the eutectic Si microstructures in Al–10Si (wt. %) base alloys with exclusive and combined addition of Sr and Sb are characterized by combined TEM and atom probe tomography (APT). The chemical short range order in Sb–Sb and Sb–Sr pairs is revealed by ab initio molecular dynamics simulation, which promotes the formation of clusters and nanoparticles. The coexistence of nanoparticles and twins is observed in Sb containing alloys, with a negative correlation in the corresponding number density, owing to the competitive stacking of precursors and individual atoms at the solid–liquid interface. Large size particles around 70 nm with a uniform distribution of Sr atoms are formed in Al–10Si–0.35Sb–0.015Sr (wt. %) alloys, due to the precursor aggregation and homogeneous nucleation in the droplets that nucleation are depressed. A model for the formation of nanoparticles and their interaction with twins is proposed. View Full-Text
Keywords: nanoparticles; twins; TEM; atom probe tomography nanoparticles; twins; TEM; atom probe tomography
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Wang, W.; Guo, F.; Gai, Z.; Zhang, T.; Tang, J.; Tian, X.; Liu, W. The Formation of Nanoparticles and Their Competitive Interaction with Twins during Eutectic Si Growth. Materials 2018, 11, 1404.

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