Growth kinetics of quasicrystalline and polytetrahedral phases of Al-Pd-Mn, Al-Co, and Al-Fe from the undercooled melt

Jan Schroers, Dirk Holland-Moritz, Dieter M. Herlach, and Knut Urban
Phys. Rev. B 61, 14500 – Published 1 June 2000
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Abstract

Melts of the alloys Al-Pd-Mn, Al-Co, and Al-Fe are containerlessly undercooled and solidified using the technique of electromagnetic levitation. The (quasi)crystal growth velocity is measured as a function of undercooling for the various phases by a high-speed infrared photosensing device. Additionally, a video image technique is applied to measure growth velocities especially at low undercoolings where sluggish growth prevails. Scanning and transmission electron microscopy as well as x-ray diffraction is utilized to identify the phases primarily solidified from distinct levels of undercooling. The experimental results are analyzed within current theories of dendritic growth. The investigations give insight into topological and chemical short-range order effects in the growth kinetics of phases with polytetrahedral ordering in the solid state.

  • Received 30 December 1999

DOI:https://doi.org/10.1103/PhysRevB.61.14500

©2000 American Physical Society

Authors & Affiliations

Jan Schroers

  • Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
  • Institut für Raumsimulation, DLR, D-51170 Köln, Germany

Dirk Holland-Moritz

  • Institut für Raumsimulation, DLR, D-51170 Köln, Germany
  • Institut für Experimentalphysik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany

Dieter M. Herlach*

  • Institut für Raumsimulation, DLR, D-51170 Köln, Germany

Knut Urban

  • Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

  • *Author to whom correspondence should be addressed. Electronic address: dieter.herlach@dlr.de

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Vol. 61, Iss. 21 — 1 June 2000

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