| Issue |
EPL
Volume 87, Number 4, August 2009
|
|
|---|---|---|
| Article Number | 40007 | |
| Number of page(s) | 6 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/87/40007 | |
| Published online | 15 September 2009 | |
Evidence of the transition from ordered to disordered growth during rapid solidification of an intermetallic phase
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR) 51170 Köln, Germany, EU
2
Institut für Experimentalphysik IV, Ruhr-Universität - 44780 Bochum, Germany, EU
Corresponding author: dieter.herlach@dlr.de
Received:
19
May
2009
Accepted:
13
August
2009
The dendrite growth velocity during solidification is measured on liquid drops of the intermetallic compound 
undercooled by levitation up to 265 K. A sharp increase of the growth velocity is found at a critical undercooling 
. In situ diffraction of synchrotron radiation on levitation-processed samples unambiguously shows a transition from ordered to disordered growth at 
. The sharp interface model is extended to describe the transition from ordered to disordered dendrite growth by taking into account the velocity dependence of the order parameter and the kinetic growth coefficient.
PACS: 05.70.Fh – Phase transitions: general studies / 81.10.-h – Methods of crystal growth; physics of crystal growth / 61.05.C- – X-ray diffraction and scattering
© EPLA, 2009
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