Molecular Dynamics Computer Simulation of Crystal Growth and Melting in Al50Ni50

Abstract

The melting and crystallization of Al50Ni50} are studied by means of molecular dynamics computer simulations, using a potential of the embedded atom type to model the interactions between the particles. Systems in a slab geometry are simulated where the B2 phase of AlNi in the middle of an elongated simulation box is separated by two planar interfaces from the liquid phase, thereby considering the (100) crystal orientation. By determining the temperature dependence of the interface velocity, an accurate estimate of the melting temperature is provided. The value k=0.0025 m/s/K for the kinetic growth coefficient is found. This value is about two orders of magnitude smaller than that found in recent simulation studies of one-component metals. The classical Wilson-Frenkel model is not able to describe the crystal growth kinetics on a quantitative level. We argue that this is due to the neglect of diffusion processes in the liquid-crystal interface.

arXiv comment6 pages, 6 figures

References in corpus (4)

• Self-diffusion and Interdiffusion in Al80Ni20 Melts: Simulation and Experiment
• The Influence of Chemical Short Range Order on Atomic Diffusion in Al-Ni Melts
• Measuring kinetic coefficients by molecular dynamics simulation of zone melting
• Simulations of binary hard-sphere crystal-melt interfaces:Interface between a one- component fcc crystal and a binary fluid mixture

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