Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-01-15

Journal: JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals: EI、SCIE

Volume: 583

Page Number: 85-90

ISSN: 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.