Volume 86, Number 3, May 2009
|Number of page(s)||4|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||12 May 2009|
Metastable formation of decagonal quasicrystals during solidification of undercooled Al-Ni melts: In situ observations by synchrotron radiation
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
Corresponding author: email@example.com
Accepted: 8 April 2009
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
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