Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/doi/10.4322/2176-1523.1076
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

PHASE DIAGRAMS AND THEIR APPLICATIONS TO Mg ALLOYS

DIAGRAMAS DE FASES E SUAS APLICAÇÕES A LIGAS DE MAGNÉSIO

Schmid-Fetzer, Rainer

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Abstract

This work summarizes the basics of phase diagrams and their relation to the Calphad method. It is emphasized that the benefits of quantitative prediction of phase formation of selected multicomponent alloys under equilibrium and special off-equilibrium processing conditions require the development of reliable and consistent thermodynamic descriptions forming a Calphad-type thermodynamic database. The implications of intermetallic phases in multicomponent Mg alloys are explained for ternary Mg-Ce-La/Nd alloys. An introduction to applications of this approach to phase formation in as-cast and heat treated Mg alloys is given and discussed in detail for the example of ternary Mg-Al-Zn alloys. The extension to truly multicomponent alloy systems and advanced kinetic calculations is briefly depicted.

Keywords

Calphad, Computational thermodynamics, Magnesium, Alloys, Phase diagrams.

Resumo

Este trabalho apresenta um sumário sobre diagramas de fases e suas relações com o método CALPHAD. Enfatiza-se que o benéfico de previsões quantitativas das fases formadas em ligas multicomponente em equilíbrio e em condições especiais de processamento fora do equilíbrio requer o desenvolvimento de descrições termodinâmicas confiáveis e consistentes, que formem um banco de dados termodinâmico do tipo CALPHAD. As implicações das fases intermetálicas nas ligas multicomponente a base de Mg são explicadas para ligas ternárias Mg-Ce-La/Nd. Uma introdução a aplicação deste enfoque a formação de fases em ligas brutas de fusão e tratadas termicamente é apresentada e discutida em detalhe em um exemplo de ligas ternárias Mg-Al-Zn. A extensão a sistemas de ligas verdadeiramente multicomponente assim como cálculos cinéticos avançados é também apresentada, de forma resumida.

Palavras-chave

CALPHAD, Termodinâmica computacional, Magnésio, Ligas, Diagramas de fase.

Referências

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