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Title: Study of heterogeneous nucleation of eutectic Si in high-purity Al-Si alloys with Sr addition
Authors: Zarif, M
Mckay, B
Schumacher, P
Keywords: Silicon alloys;Solidification;Droplets
Issue Date: 2011
Publisher: ASM International
Citation: Metallurgical and Materials Transactions A
Abstract: Al-5 wt pct Si master-alloys with controlled Sr and/or P addition/s were produced using super purity Al 99.99 wt pct and Si 99.999 wt pct materials in an arc melter. The master-alloy was melt-spun resulting in the production of thin ribbons. The Al matrix of the ribbons contained entrained Al-Si eutectic droplets that were subsequently investigated. Differential scanning calorimetry, thermodynamic calculations, and transmission electron microscopy techniques were employed to examine the effect of the Sr and P additions on eutectic undercoolings and nucleation phenomenon. Results indicate that, unlike P, Sr does not promote nucleation. Increasing Sr additions depressed the eutectic nucleation temperature. This may be a result of the formation of a Sr phase that could consume or detrimentally affect potent AlP nucleation sites.
Description: The official published version can be accessed from the link below - Copyright @ 2010 The Minerals, Metals & Materials Society and ASM International
ISSN: 1073-5623
Appears in Collections:Publications
Brunel Centre for Advanced Solidification Technology (BCAST)

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