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Nucleation Behavior and Solid-Liquid Interfacial Energy of Polytetrahedral Phases

Published online by Cambridge University Press:  15 February 2011

Dirk Holland-Moritz
Dirk Holland-Moritz*
Affiliation:
Institut für Raumsimulation, DLR, D-51170 Köln, Germany Harvard University, Division of Engineering and Applied Sciences, Cambridge, MA 02138, USA
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Abstract

According to classical nucleation theory the nucleation- and phase-selection behavior of undercooled meltallic melts is strongly dependent on the solid-liquid interfacial energy.

A structural approach to the modelling of the interfacial energy for simple melt-crystal interfaces (fcc, hcp, bcc) was developed a number of years ago [1-4]. This approach is extended to polytetrahedral phases using numerical simulation. Results of these calculations are presented for different polytetrahedral structures: the tetragonal σ-phase in Ni-V, the monoclinic phase λ-Al13Fe4, the orthorhombic phase μ-Al5Fe2 and the icosahedral quasicrystalline I-phase in Al-Pd-Mn. The numerically estimated values for the solid-liquid interfacial energy are compared with results from experiments on the undercooling- and phase-selection behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 245
Copyright
Copyright © Materials Research Society 2000

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