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Indexed by:期刊论文

Date of Publication:2014-01-15

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI

Volume:583

Page Number:85-90

ISSN No.:0925-8388

Key Words:Alloy solidification refining method; Microstructure and morphology; Boron distribution; Tin; Si-Al alloy

Abstract: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 alpha Al + Si structures with flake-like eutectic Si were found in Si-Al alloy; while an additional structure of alpha Al + beta Sn + Si in Si-Al-Sn alloy was found. Si in aAl + Si eutectic had a globular shape, whereas some Si in alpha Al + beta Sn + 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. alpha Al + Si for Si-Al system and alpha Al + beta Sn + 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. (C) 2013 Elsevier B. V. All rights reserved.