Effect of Sn content on microstructure and boron distribution in Si–Al alloy

•Si–Al alloy with Sn addition was used for boron removal.•Sn addition effects on the eutectic silicon morphologies of Si–Al.•B was detected in Sn in much higher concentration than in Al by EPMA line analysis. Si–Al and Si–Al–Sn alloy melts were used for silicon purification by alloy solidification r...

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Bibliographic Details
Published in:Journal of alloys and compounds 2014, Vol.583, p.85-90
Main Authors: Li, Yaqiong, Tan, Yi, Li, Jiayan, Xu, Qiang, Liu, Yao
Format: Article
Language:English
Subjects:
Alloy solidification refining method
Alloying additive
Boron
Boron distribution
Cross-disciplinary physics: materials science
rheology
Eutectics
Exact sciences and technology
Materials science
Melts
Microstructure
Microstructure and morphology
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Refining
Silicon
Si–Al alloy
Solidification
Tin
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Summary:•Si–Al alloy with Sn addition was used for boron removal.•Sn addition effects on the eutectic silicon morphologies of Si–Al.•B was detected in Sn in much higher concentration than in Al by EPMA line analysis. Si–Al and Si–Al–Sn alloy melts were used for silicon purification by alloy solidification refining method. The effects of Sn addition on alloy microstructure, eutectic Si morphology, as well as B distribution were investigated using optical microscopy, scanning electron microscopy, electron probe microanalyzer and inductively coupled plasma mass spectrometer. Primary Si and αAl+Si structures with flake-like eutectic Si were found in Si–Al alloy; while an additional structure of αAl+βSn+Si in Si–Al–Sn alloy was found. Si in αAl+Si eutectic had a globular shape, whereas some Si in αAl+βSn+Si eutectic had an octahedral shape. Compared with primary Si, more boron was found to distribute in final solidified phase during the solidification, i.e. αAl+Si for Si–Al system and αAl+βSn+Si for Si–Al–Sn system. The refining ratio of B decreased with increasing Al content in Si–Al alloy melt, while increased with Sn addition using Si–Al–Sn alloy melt.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.08.145