Phase field simulations in miscibility gaps

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Maria Helena Sousa Soares de Oliveira Braga (Autor) FEUP; Joana Cassilda Rodrigues Espain de Oliveira (Autor) FEUP; Luís Filipe Malheiros de Freitas Ferreira (Autor) FEUP; J. A. Ferreira (Autor) Outra

Revista

Título: Calphad: Computer Coupling of Phase Diagrams and Thermochemistry

Vol. 33 Nº 1

Páginas: 237-243

ISSN: 0364-5916

Editora: Elsevier

Indexação

ISI Web of Knowledge - 11 Citações

ISI Web of Science

Scopus - 12 Citações

INSPEC

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

CORDIS: Ciências Físicas > Física > Termodinâmica

Outras Informações

ID Authenticus: P-003-MNP

DOI: 10.1016/j.calphad.2008.10.004

Abstract (EN): Using phase field simulations, it is possible to simulate the dynamics and morphology of immiscible liquids/solids appearing at the miscibility gap of any system. These simulations may also be used to determine the asymptotic compositions of the fluids for a given Gibbs energy. Even more, it is known that different parameters of the excess Gibbs energy of a certain phase may exhibit different asymptotic morphologies, in spite of the similarity of the associated equilibrium curves. This method can be used to choose the best excess Gibbs energy' parameters for the liquid (or solid) phase of a system that will suffer spinodal decomposition. It can also be important (like in the solgel process) to choose the best composition, temperature and time to obtain a certain wanted morphology, just by means of the Gibbs energy of the respective phase. In this work, we have performed phase field simulations of the two liquid's separation occurring in the BiZn system, for different temperatures, concentrations and times. We have found a rich diversity of asymptotic morphologies for different points of the BiZn phase diagram. Two different Gibbs energies were used to show how the morphologies will be affected by different parameters of the excess Gibbs energy.

Idioma: Inglês

Tipo (Avaliação Docente): Científica