Modeling Melting in Binary Systems

Details Modeling Melting in Binary Systems Modeling Melting in Binary Systems

2003-01-20

arxiv.org/abs/cond-mat/0301342v1

Physica A 248 issue 3-4 (1998)

Physics

Condensed Matter

Statistical Mechanics

22 Latex pages, 6 .eps figures

Scientific paper

A coarsened model for a binary system with limited miscibility of components is proposed; the system is described in terms of structural states in small parts of the material. The material is assumed to have two alternative types of crystalline local arrangements associated with two components of the alloy. Fluctuating characteristics of a cluster are the type and the space orientation of its crystalline arrangement. There are two different phase transitions in the model system, an orientation order-disorder transition representing melting, and a phase transition between phases differing in concentration of components. Depending on the parameters characterizing the interaction in the system, this last transition may take place both in the crystalline and in the amorphous (molten) phase. A special approximation is used to study the thermodynamics of the system. The calculated phase diagram describes, at least qualitatively, the most important features of a binary system.

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