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http://bura.brunel.ac.uk/handle/2438/6159
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 |
URI: | http://bura.brunel.ac.uk/handle/2438/6159 |
DOI: | http://dx.doi.org/10.1007/s11661-010-0553-3 |
ISSN: | 1073-5623 |
Appears in Collections: | Publications Brunel Centre for Advanced Solidification Technology (BCAST) |
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