Phase Diagrams & Computational Thermodynamics

Research Program

The NIST Metallurgy Division has long played a major role in the generation, evaluation and use of alloy phase diagrams. Between 1982 and 1990, an international effort to evaluate binary phase diagrams was coordinated by the Metallurgy Division and ASM. In recent years, our effort has focussed on some specific families of alloys, including nickel-based superalloys for aerospace applications and high-temperature and lead-free solders.

A phase diagram is the representation of phase equilibria present in a system as function of the controlling variables, typically composition and temperature.

Computational Thermodynamics is the discipline by which phase diagrams are generated by analysis of the basic thermodynamic properties of the system. Computational thermodynamics enables us to predict some features of the system which are not easily measured, as well as to predict phase diagrams of complex multicomponent systems.

• Read the about our technical activities in the Metallurgy Division Annual Report.
   
• Read some papers by NIST staff on how phase diagrams are generated and used.
   
• See results of NIST work on solder systems.
   
• See a list of the Metallurgy Division staff working on phase diagrams and computational thermodynamics.

• Follow the link to the Ceramics WebBook to find information on ceramic systems and a glossary of phase equilibria terms.
   
• Follow the link to ASM to find more information on the handbooks on Binary Alloy Phase Diagrams that resulted from the NIST/ASM collaboration.