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Published Online October 6, 2005
Science DOI: 10.1126/science.1118611

Reports

Submitted on August 9, 2005
Accepted on September 21, 2005

Ordered Liquid Aluminum at the Interface with Sapphire

Sang Ho Oh 1, Yaron Kauffmann 2, Christina Scheu 3, Wayne D. Kaplan 2*, Manfred Rühle 1

1 Max-Planck-Institut für Metallforschung, Stuttgart, Germany.
2 Department of Materials Engineering, Technion - Israel Institute of Technology, Haifa, Israel.
3 Max-Planck-Institut für Metallforschung, Stuttgart, Germany; Now Department of Physical Metallurgy and Materials Testing; University of Leoben, Leoben, Austria.

* To whom correspondence should be addressed.
Wayne D. Kaplan , E-mail: kaplan{at}tx.technion.ac.il

Understanding the nature of solid-liquid interfaces is important for many processes of technological interest, such as solidification, liquid phase epitaxial growth, wetting, liquid phase joining, crystal growth, and lubrication. Recent studies have reported on indirect evidence of density fluctuations at solid-liquid interfaces, based on x-ray scattering methods which have been complemented by atomistic simulations. We provide evidence for ordering of liquid atoms adjacent to an interface with a crystal, based on real-time high temperature observations of alumina-aluminum solid-liquid interfaces at the atomic length scale. In addition, crystal growth of alumina into liquid aluminum, facilitated by interfacial transport of oxygen from the microscope column, was observed in-situ using high resolution transmission electron microscopy.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)