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Partial pair correlation functions and viscosity of liquid Al–Si hypoeutectic alloys via high-energy X-ray diffraction experiments

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Srirangam, Prakash, Jeyakumar, Manickaraj, Kramer, Mathew J. and Shankar, Sumanth (2011) Partial pair correlation functions and viscosity of liquid Al–Si hypoeutectic alloys via high-energy X-ray diffraction experiments. Philosophical Magazine, 91 (30). pp. 3867-3904. doi:10.1080/14786435.2011.597360

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Official URL: http://dx.doi.org/10.1080/14786435.2011.597360

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Abstract

The liquid structure of Al–Si hypoeutectic binary alloys was characterized by diffraction experiments using a high-energy X-ray (synchrotron) beam source. The diffraction experiments were carried out for liquid pure Al, Al–3 wt% Si, Al–7 wt% Si, Al–10 wt% Si and Al–12.5 wt% Si alloys at several temperatures. The salient structure information such as structure factor (SF), pair distribution function (PDF), radial distribution function (RDF), coordination number (CN) and atomic packing densities (PD) were quantified as a function of Si concentration and melt temperatures. Reverse Monte Carlo (RMC) analysis was carried out using the diffraction experimental data to quantify the partial pair correlation functions, such as partial structure factor, partial pair distribution function (PPDF) and partial radial distribution function. Furthermore, the partial pair distribution function and the liquid atomic structure information were used in a semi-empirical model to evaluate the viscosity of these liquid alloys at various melt temperatures. The results show that the viscosity determined by semi-empirical methods using the atomic structure information is in good agreement with the experimentally determined viscosity values.

Item Type: Journal Article
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title: Philosophical Magazine
Publisher: Taylor & Francis
ISSN: 1478-6435
Official Date: 2011
Dates:
DateEvent
2011Published
Volume: 91
Number: 30
Page Range: pp. 3867-3904
DOI: 10.1080/14786435.2011.597360
Status: Peer Reviewed
Publication Status: Published

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