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Study of Heterogeneous Nucleation of Eutectic Si in High-Purity Al-Si Alloys with Sr Addition

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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.

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Acknowledgments

The authors would like to thank Professor G. Dehm at the Erich Schmidt Institute, Leoben for access to the TEM facilities and Dr. Rashkova for assistance with TEM imaging. All other experimental work was performed at the Chair of Casting Research, University of Leoben, Austria. In addition, Muhammad Zarif gratefully acknowledges financial support from the Higher Education Commission of Pakistan and managerial support from the ÖAD.

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Authors and Affiliations

  1. University of Leoben, Leoben, Austria

    Muhammad Zarif (Ph.D. Student and Chair of Casting Research)

  2. BCAST Brunel University, Uxbridge, Middlesex, U.K

    Brian Mckay (Lecturer)

  3. University of Leoben and, Managing Director, with OGI, Leoben, Austria

    Peter Schumacher (Professor and Head of Department at Chair of Casting Research)

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  1. Muhammad Zarif
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  2. Brian Mckay
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  3. Peter Schumacher
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Correspondence to Peter Schumacher.

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Manuscript submitted November 20, 2009.

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Zarif, M., Mckay, B. & Schumacher, P. Study of Heterogeneous Nucleation of Eutectic Si in High-Purity Al-Si Alloys with Sr Addition. Metall Mater Trans A 42, 1684–1691 (2011). https://doi.org/10.1007/s11661-010-0553-3

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