Issue
EPL
Volume 86, Number 3, May 2009
Article Number 36002
Number of page(s) 4
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/36002
Published online 12 May 2009
EPL, 86 (2009) 36002
DOI: 10.1209/0295-5075/86/36002

Metastable formation of decagonal quasicrystals during solidification of undercooled Al-Ni melts: In situ observations by synchrotron radiation

O. Shuleshova1, D. Holland-Moritz2, W. Löser1, G. Reinhart3, G. N. Iles3 and B. Büchner1

1   Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden - 01171 Dresden, Germany, EU
2   Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR) 51170 Köln, Germany, EU
3   ESA External Research Fellows, ESRF/ILL - 38042 Grenoble, France, EU

o.shuleshova@ifw-dresden.de

received 26 February 2009; accepted in final form 8 April 2009; published May 2009
published online 12 May 2009

Abstract
Time-resolved in situ measurements using a combination of the electromagnetic levitation technique and energy dispersive diffraction of synchrotron radiation have been applied to the solidification of undercooled Al-Ni melts with 18–31.5 at.% Ni. Undercooling below the liquidus temperature did not alter the primary phase selection. However, during further cooling of semisolid samples the formation of a metastable decagonal quasicrystalline phase was observed, depending on the processing conditions. This metastable phase subsequently transforms and can only be retained at room temperatures when cooling with sufficient rates.

PACS
64.60.My - Metastable phases.
61.44.Br - Quasicrystals.
61.05.cp - X-ray diffraction.

© EPLA 2009