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Diffusion-controlled crystal growth in deeply undercooled Zr50Cu50 melt on approaching the glass transition

Wang, Q. and Wang, L.-M. and Ma, M.Z. and Binder, S. and Volkmann, T. and Herlach, D. and Wang, J.S. and Xue, Q.G. and Tian, Y.J. and Liu, R.P. (2011) Diffusion-controlled crystal growth in deeply undercooled Zr50Cu50 melt on approaching the glass transition. Physical Review B, 83, 014202-1-014202-5. American Physical Society. DOI: 10.1103/PhysRevB.83.014202.

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Crystal-growth velocity in metallic melts has been reported by others to increase monotonically with undercooling. Nevertheless, such an observation is not predicted by conventional growth theory. In this work, the metallic melt of Zr50Cu50 is studied to address the problem by measuring the growth velocity over a wide range of undercooling up to 325 K. A maximum growth velocity is observed at an undercooling of 200 K instead of the monotonic increase reported in the literature. We find that the planar or dendrite growth theories can explain the value of the maximum growth velocity, but the predicted location of the maximum in undercooling is far less than that seen by experiment. With the assistance of current results, a general pattern of crystal growth is established for melts of a variety of substances, where all sluggish crystal-growth kinetics is explained by the diffusion-controlled mechanism at deep undercooling.

Document Type:Article
Title:Diffusion-controlled crystal growth in deeply undercooled Zr50Cu50 melt on approaching the glass transition
AuthorsInstitution or Email of Authors
Wang, Q.Yanshan University, China
Wang, L.-M.Yanshan University, China
Ma, M.Z.Yanshan University, China
Binder, S.sven.binder@dlr.de
Volkmann, T.thomas.volkmann@dlr.de
Herlach, D.dieter.herlach@dlr.de
Wang, J.S.University of Science and Technology Beijing, China
Xue, Q.G.University of Science andTechnology Beijing, China
Tian, Y.J.Yanshan University, China
Liu, R.P.Yanshan University, China
Date:January 2011
Journal or Publication Title:Physical Review B
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:014202-1-014202-5
Publisher:American Physical Society
Keywords:undercooling, electrostatic levitation, dendrite growth, diffusion, glass transition
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dieter Herlach
Deposited On:28 Jan 2011 07:39
Last Modified:12 Dec 2013 21:14

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