FactSage

Factsage is a commercial software package used in materials science and metallurgy for thermodynamic analysis and phase equilibrium calculations. It is designed to apply CALPHAD (CALculation of PHAse Diagrams) methods to systems containing multiple chemical elements and phases. The package typically includes a suite of thermodynamic databases, calculation engines, and a user interface, enabling users to construct phase diagrams, evaluate Gibbs energies, and predict phase fractions, activities, and other thermodynamic properties across ranges of temperature, pressure, and composition.

Applications include alloy design, ceramic and mineral processing, slags and metallurgical processing, corrosion studies, and high-temperature materials research. It is used in both academic research and industrial development to screen compositions, optimize processing conditions, and interpret experimental results.

Historically, FactSage has evolved through multiple generations, with updates adding new databases, improved algorithms, and expanded capabilities for complex multi-component systems. Access is typically via licensing to universities, research institutions, and industry users; it requires training to develop and interpret CALPHAD-based results.

Limitations: The accuracy of results depends on the underlying thermodynamic data and model parameters; users must validate calculations against experimental data. See also CALPHAD, phase diagram, thermodynamics, materials science.