Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Thermodynamic Assessment of the Co-Mo System



Albert Davydov, Ursula R. Kattner


The experimental thermochemical and phase diagram data for the Co-Mo system were assessed. A consistent thermodynamic description, using a Redlich-Kister model for the solution phases and sublattice and line compound models for the intermetallics, was obtained and agrees well with the critically evaluated experimental data from the literature. Several variations of the sublattice model for the ς and phases were compared with the traditional models used for these phases in other systems. Inclusion of the magnetic contribution to the Gibbs energy expressions of the Co-based solid solutions produced an abrupt decrease of the terminal Mo solubility in the fcc (Co) phase with decreasing temperature consistent with measured data. The magnetic contribution to the thermodynamic properties also suggested the formation of a fcc (Co) miscibility gap, and a high temperature stability region of the paramagnetic hcp (Co) phase.
Journal of Phase Equilibria


Co-Mo, phase diagram, superalloys, thermodynamic assessment, thermodynamics


Davydov, A. and Kattner, U. (2008), Thermodynamic Assessment of the Co-Mo System, Journal of Phase Equilibria (Accessed May 22, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created October 16, 2008